NullReferenceException in Microsoft.NET.Build.Tasks.ProjectContext after broken restore #39316

drewnoakes · 2024-03-08T03:35:38Z

I was trying to update some packages and got into a funky state. The following exception appeared in the VS Error List.

MSB4018	The "ResolvePackageAssets" task failed unexpectedly.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.NET.Build.Tasks.ProjectContext.<>c__DisplayClass31_0.<GetTopLevelDependencies>b__3(String projectFileDependency)
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.ComputePackageExclusions()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter..ctor(ResolvePackageAssets task)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
   at Microsoft.NET.Build.Tasks.TaskBase.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()	VisualStudioEditorsSetup	C:\Program Files\dotnet\sdk\8.0.300-preview.24122.6\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets	266

I don't have clear repro steps unfortunately.

The exception appears to be within this block of code:

sdk/src/Tasks/Microsoft.NET.Build.Tasks/ProjectContext.cs

Lines 197 to 210 in 383d2f8

    
           .Select(projectFileDependency => 
        
           { 
        
               int separatorIndex = projectFileDependency.IndexOf(' '); 
        
               string libraryName = separatorIndex > 0 ? 
        
                   projectFileDependency.Substring(0, separatorIndex) : 
        
                   projectFileDependency; 
        
               if (!string.IsNullOrEmpty(libraryName) && libraryLookup.ContainsKey(libraryName)) 
        
               { 
        
                   return libraryName; 
        
               } 
        
               return null; 
        
           })

At a glance it seems like either projectFileDependency would be the most likely null, meaning a dependency group contains a null dependency, which seems problematic. It might be a bug on the NuGet side. If I see this again, I'll grab a copy of the assets file.

The text was updated successfully, but these errors were encountered:

dotnet-policy-service · 2024-03-08T16:04:41Z

Thanks for creating this issue! We believe this issue is related to NuGet tooling, which is maintained by the NuGet team. Thus, we closed this one and encourage you to raise this issue in the NuGet repository instead. Don’t forget to check out NuGet’s contributing guide before submitting an issue!

If you believe this issue was closed out of error, please comment to let us know.

Happy Coding!

baronfel · 2024-03-08T16:07:13Z

reopening and retagging - this should be kept open until we can prove a problem on the NuGet side.

hansmbakker · 2024-04-16T11:29:06Z

I have this problem with a .NET MAUI project after updating to

SDK 9.0.100-preview.3.24204.13
updated workload
updated target frameworks to net9.0-android in the projects

Operating system is Windows 11 23H2, build 22631.3447

dotnet restore / dotnet build works well, but I get this error with Build / Rebuild in Visual Studio 17.10.0 Preview 3.0

drewnoakes · 2024-04-29T04:43:17Z

I'm hitting this again now. I've pushed the state that repros it to: https://github.com/drewnoakes/project-system/tree/dotnet-sdk-issue-39316-repro

Project: ProjectSystemSetup
File: C:\Program Files\dotnet\sdk\8.0.300-preview.24203.14\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets
Line: 266

stephentoub · 2024-05-18T03:23:07Z

I'm hitting this as well. I get it even from the command-line, e.g. doing a dotnet clean I got:

    C:\Program Files\dotnet\sdk\9.0.100-preview.4.24210.38\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:
      The "ResolvePackageAssets" task failed unexpectedly.
      System.NullReferenceException: Object reference not set to an instance of an object.
         at Microsoft.NET.Build.Tasks.ProjectContext.<>c__DisplayClass31_0.<GetTopLevelDependencies>b__3(String projectFileDependency)
         at System.Linq.Enumerable.IteratorSelectIterator`2.MoveNext()
         at System.Linq.Enumerable.IEnumerableWhereIterator`1.ToArray()
         at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.ComputePackageExclusions()
         at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash)
         at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
         at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
         at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
         at Microsoft.NET.Build.Tasks.TaskBase.Execute()
         at Microsoft.NET.Build.Tasks.TaskBase.Execute()
         at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
         at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost
       taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask)

xaviergxf · 2024-05-23T15:40:34Z

I'm also hitting the same issue when trying to setup Aspire to work with a monolith. Is there a workaround?

C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: The "ResolvePackageAssets" task failed unexpectedly.
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: System.NullReferenceException: Object reference not set to an instance of an object.
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.LockFileExtensions.<GetProjectFileDependencySet>g__IndexOfWhiteSpace|6_1(String s)
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.LockFileExtensions.GetProjectFileDependencySet(LockFile lockFile, String frameworkAlias)
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.<WritePackageDependenciesDesignTime>g__GetPackageDependencies|59_0()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WritePackageDependenciesDesignTime()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteItemGroup(Action writeItems)
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteItemGroups()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.Write()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteToCacheFile()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash)
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
1>C:\Program Files\dotnet\sdk\8.0.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()

7Fathoms · 2024-05-23T17:01:43Z

As @hansmbakker suggested, using the dotnet cli is one workaround. Once compiled then VS seems to work. Another option is to copy the AndroidManifest.xml file from the Platforms/Android folder to the same location as the Maui project file.

drewnoakes · 2024-05-24T01:25:18Z

I've been hitting this every few days, usually following a branch switch that changes what packages/versions the solution has.

Evangelink · 2024-06-18T13:03:13Z

I am also hitting this issue (seems consistent for now locally).

Rohith-Reddy-k · 2024-06-20T03:49:06Z

+1 unable to build the project using visual studio, but able to build via developer command prompt using msbuild

drewnoakes · 2024-06-20T10:13:54Z

Is everyone who hits this using central package versioning? (Or is anyone seeing this without using CPM?)

Evangelink · 2024-06-20T10:14:39Z

I am using CPM yes

hansmbakker · 2024-06-20T10:53:07Z

I'm also using CPM indeed.

7Fathoms · 2024-06-21T09:37:00Z

Me as well.

xaviergxf · 2024-06-21T15:14:17Z

CPM as well

Rohith-Reddy-k · 2024-06-26T06:24:52Z

Did anyone recently update their targeting framework to .net8.0? For me I am suspecting this is due to that.

jflevesque-genetec · 2024-07-02T22:22:33Z

I'm also hitting this issue. I have a 2nd Directory.Packages.props in a test folder to add GlobalPackageReferences for test dependencies and while I have this file present, I'm getting the same error as the others. If I remove that file, the error disappears. Possibly related?

lsoft · 2024-07-15T08:02:10Z

Same issue. CPM, net8-android, Directory.Packages.props - all ingredients are here.

mungk · 2024-07-18T15:23:59Z

I encountered this issue when I was uninstalling a particular package. I removed the PackageVersion entry for the library from my Directory.Packages.props but still had the PackageReference for that library in the project. In that state, I received this error. After I removed the PackageReference tag from the projects, the error went away.

In the past, when this situation occurred there was a different error message, but I can't quite recall what it used to say. Something about a missing package version I thought, but not positive.

rick-micpoint · 2024-07-25T15:15:32Z

I have two of the issues described above. First I had some missing package versions, which results in the exception instead of a proper error message. Once I fixed those I was left with one project that I couldn't fix, a .NET MAUI project. This one keeps throwing the exception despite fixing the versioning.

Building it from the command line did work however, and after doing that once I can build it from visual studio as well.

The tools need to be made more resilient and should be able to properly report edge errors instead of crash. And the issue with android is just a bug in itself.

giulianob · 2024-08-26T17:50:19Z

Getting this error but it was due to a package that was missing from my Directory.Package.Props. I received the null ref exception when using msbuild or dotnet msbuild but dotnet build shows the correct error and once fixed it worked.

> dotnet msbuild
MSBuild version 17.11.3+0c8610977 for .NET
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: The "ResolvePackageAssets" task failed unexpectedly. [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: System.NullReferenceException: Object reference not set to an instance of an object. [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ProjectContext.<>c__DisplayClass31_0.<GetTopLevelDependencies>b__3(String projectFileDependency) [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.SelectEnumerableIterator`2.MoveNext() [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.WhereEnumerableIterator`1.ToArray() [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.ComputePackageExclusions() [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash) [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task) [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups() [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore() [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute() [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Execute() [test.csproj]
C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(TaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask) [test.csproj]


❯ dotnet build
  Determining projects to restore...
test.csproj : error NU1010: The PackageReference items Microsoft.AspNetCore.Mvc.Testing do not have corresponding PackageVersion.
  Failed to restore test.csproj (in 38 ms).
  39 of 40 projects are up-to-date for restore.

Build FAILED.

test.csproj : error NU1010: The PackageReference items Microsoft.AspNetCore.Mvc.Testing do not have corresponding PackageVersion.
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:01.32

tmacam · 2024-09-18T18:37:01Z

Finding a similar issue. Building the project from the CLI with dotnet build succeeds but building the project from Visual Studio produces the following error:

Severity	Code	Description	Project	File	Line	Suppression State
Error (active)	MSB4018	The "ResolvePackageAssets" task failed unexpectedly.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.NET.Build.Tasks.LockFileExtensions.<GetProjectFileDependencySet>g__IndexOfWhiteSpace|6_1(String s)
   at Microsoft.NET.Build.Tasks.LockFileExtensions.GetProjectFileDependencySet(LockFile lockFile, String frameworkAlias)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.<WritePackageDependenciesDesignTime>g__GetPackageDependencies|59_0()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WritePackageDependenciesDesignTime()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteItemGroup(Action writeItems)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteItemGroups()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.Write()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteToCacheFile()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
   at Microsoft.NET.Build.Tasks.TaskBase.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()	Microsoft.ContainerApps.FunctionApp.DurableAsyncOperations	C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets	266

I notice that my stack trace is slightly different than the one in the main comment as, among other things, it does not mention a ctor.

hamarb123 · 2024-09-20T09:32:57Z

I'm getting this attempting to compile roslyn on command-line for about 9 of the projects:

C:\Path\To\Roslyn\.dotnet\sdk\9.0.100-preview.7.24407.12\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: (repeated at start of every line, ommited for clarity)
The "ResolvePackageAssets" task failed unexpectedly. [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
System.NullReferenceException: Object reference not set to an instance of an object. [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ProjectContext.<>c__DisplayClass31_0.<GetTopLevelDependencies>b__3(String projectFileDependency) [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source) [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ProjectContext.GetTopLevelDependencies(LockFile lockFile, LockFileTarget lockFileTarget) [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.ComputePackageExclusions() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter..ctor(ResolvePackageAssets task) [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash) [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task) [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.NET.Build.Tasks.TaskBase.Execute() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.Build.BackEnd.TaskExecutionHost.Execute() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() [C:\Path\To\Roslyn\src\VisualStudio\IntegrationTest\TestSetup\Microsoft.VisualStudio.IntegrationTest.Setup.csproj]

Edit: I've saved the state of the VM as a snapshot, so theoretically I should be able to load up that version and repro it later if needed.
Edit 2: doesn't reproduce anymore when I change to rc 1 in the global.json.

lsoft · 2024-09-27T08:43:11Z

any plans here? I face it constantly, a lot of times every day... This is something very painful.

baronfel · 2024-09-27T13:12:34Z

@lsoft what version of VS and the SDK are you using? We think this should be resolved in more recent versions of the SDK.

abatishchev · 2024-09-27T15:58:10Z

I hit the issue when was migrating an .msbuildproject to CPM:

The "ResolvePackageAssets" task failed unexpectedly.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.NET.Build.Tasks.LockFileExtensions.<GetProjectFileDependencySet>g__IndexOfWhiteSpace|6_1(String s)
   at Microsoft.NET.Build.Tasks.LockFileExtensions.GetProjectFileDependencySet(LockFile lockFile, String frameworkAlias)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.<WritePackageDependenciesDesignTime>g__GetPackageDependencies|59_0()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WritePackageDependenciesDesignTime()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteItemGroup(Action writeItems)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteItemGroups()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.Write()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.WriteToCacheFile()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
   at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
   at Microsoft.NET.Build.Tasks.TaskBase.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()	TypeSpec	C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets	266

lsoft · 2024-09-27T15:58:26Z

@baronfel

Microsoft Visual Studio Enterprise 2022 (64-bit) - Current
Version 17.11.4

C:\Users\ls>dotnet --list-sdks
2.1.818 [C:\Program Files\dotnet\sdk]
3.1.201 [C:\Program Files\dotnet\sdk]
3.1.417 [C:\Program Files\dotnet\sdk]
5.0.302 [C:\Program Files\dotnet\sdk]
5.0.405 [C:\Program Files\dotnet\sdk]
5.0.416 [C:\Program Files\dotnet\sdk]
6.0.101 [C:\Program Files\dotnet\sdk]
6.0.407 [C:\Program Files\dotnet\sdk]
8.0.400 [C:\Program Files\dotnet\sdk]

csproj:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0-android</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>disable</ImplicitUsings>
  </PropertyGroup>
</Project>

minimal build log:

20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: The "ResolvePackageAssets" task failed unexpectedly.
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: System.NullReferenceException: Object reference not set to an instance of an object.
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ProjectContext.<>c__DisplayClass31_0.<GetTopLevelDependencies>b__3(String projectFileDependency)
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.ComputePackageExclusions()
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter..ctor(ResolvePackageAssets task)
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash)
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute()
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
20:57:16:565	1>C:\Program Files\dotnet\sdk\8.0.400\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()
20:57:16:565	1>Done building project "REMOVED.csproj" -- FAILED.
20:57:16:582	========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

AdriaanLarcai · 2024-10-07T10:34:35Z

This is ridiculous.

lsoft · 2024-10-07T11:03:27Z

I see the same issue with the latest SDK

16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: The "ResolvePackageAssets" task failed unexpectedly.
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018: System.NullReferenceException: Object reference not set to an instance of an object.
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ProjectContext.<>c__DisplayClass31_0.<GetTopLevelDependencies>b__3(String projectFileDependency)
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter.ComputePackageExclusions()
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheWriter..ctor(ResolvePackageAssets task)
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader.CreateReaderFromDisk(ResolvePackageAssets task, Byte[] settingsHash)
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.CacheReader..ctor(ResolvePackageAssets task)
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ReadItemGroups()
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.ResolvePackageAssets.ExecuteCore()
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.NET.Build.Tasks.TaskBase.Execute()
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
16:01:59:141	1>C:\Program Files\dotnet\sdk\8.0.402\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5): error MSB4018:    at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()

as I posted above, I politely ask about plans here?

lsoft · 2024-10-07T12:00:24Z

Because I see the error constantly, how can I reproduce this with the sources of SDK inside a Visual Studio?

lsoft · 2024-10-07T14:16:48Z

after digging a bit, I can confirm that the root of problem is in restoring nuget packages.

if I run dotnet restore of the csproj then everything is good and project.assets.json contains normal centralPackageVersions node, and framework/.../dependencies has correct version nodes for example "version": "[8.0.0, )".

but if I delete obj folder, and press rebuild in visual studio, I see that project.assets.json DOES NOT contains normal centralPackageVersions node, and framework/.../dependencies nodes has EMPTY version: "version": "(, )".

Looks like building inside VS (via msbuild?) do not see the versions from Directory.Packages.props for some reason I can't investigate.

ADDITIONAL NOTE: I have a few nuget packages deploed in my Directory.Build.props in addition for those who are deployed in the csproj.

PaulVrugt · 2024-10-08T11:39:12Z

so, is there a way to get rid of the error? I did "something" to get this error, but now it won't go away anymore

edit; ok never mind, in my case it was caused by a package reference for which no version was specified in my Directory.Packages.Props file

olivier-spinelli · 2024-10-09T10:35:38Z

This just occured on the up to date Microsoft Visual Studio Enterprise 2022 (64-bit) - Current Version 17.11.5.
This is more than annoying...

divega · 2024-10-10T18:14:07Z

so, is there a way to get rid of the error? I did "something" to get this error, but now it won't go away anymore

edit; ok never mind, in my case it was caused by a package reference for which no version was specified in my Directory.Packages.Props file

Thank you @PaulVrugt. This was helpful! Doing the restore in the command line reported which package it was. Not sure why in VS the restore is crashing.

marcpopMSFT · 2024-11-12T21:12:49Z

@jeffkl did NuGet end up looking into providing a better error experience here or should we? I believe this is a case of null values in the project.assets.json most commonly when onboarding to CPM and not setting a version for everything.

jeffkl · 2024-11-12T21:17:50Z

I believe we fixed NuGet so it won't write null values but I would expect the SDK to still have some safeguards in case the assets file ends up being written differently? I would certainly hope if NuGet changes the schema in anyway that we don't break this component, but it might be worth having code in the SDK that gives a better error as well.

Phlow2001 · 2024-11-18T21:58:50Z

This was indeed caused by a null in project.assets.json. The null was caused, presumably, by a removed PackageVersion in a central package management Directory.Packages.props but having a PackageReference still looking for it at the .csproj level. It seems like this can happen easily with multiple solutions and dependants on central package management.

This could absolutely use a better error message.

dotnet-issue-labeler bot added Area-NetSDK untriaged Request triage from a team member labels Mar 8, 2024

drewnoakes added the Area-NuGet label Mar 8, 2024

dotnet-policy-service bot closed this as completed Mar 8, 2024

baronfel reopened this Mar 8, 2024

baronfel removed the Area-NuGet label Mar 8, 2024

marcpopMSFT assigned dsplaisted Apr 2, 2024

drewnoakes added a commit to drewnoakes/project-system that referenced this issue Apr 29, 2024

Repro state for dotnet/sdk#39316

4ad6dd7

drewnoakes mentioned this issue Jun 20, 2024

Restore may write nulls to project.assets.json NuGet/Home#13563

Closed

marcpopMSFT added the needs team triage Requires a full team discussion label Nov 6, 2024

marcpopMSFT added this to the Backlog milestone Nov 19, 2024

marcpopMSFT removed untriaged Request triage from a team member needs team triage Requires a full team discussion labels Nov 19, 2024

edvilme mentioned this issue Jan 10, 2025

Refactor GetPackageNameFromDependency #45873

Draft

NullReferenceException in Microsoft.NET.Build.Tasks.ProjectContext after broken restore #39316

NullReferenceException in Microsoft.NET.Build.Tasks.ProjectContext after broken restore #39316

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