Error: Bytecode is not a valid hex string using OZ upgrades deployProxy

[karacurt]

I am facing the following error:

Error: Bytecode is not a valid hex string

The error happens when we run npx hardhat compile and then runs npx hardhat coverage

The line in the code is trying to call upgrades.deployProxy to deploy an upgradeable contract

Hardhat version: "hardhat": "^2.12.6"
Solidity Coverage version: "solidity-coverage": "^0.8.2",

[cgewecke]

@karacurt Could you try upgrading to the latest version of solidity-coverage (0.8.10) and also make sure your hardhat version is newer, e.g 2.20.0 or higher?

If the problem persists could you provide the full stack trace of the error?

[karacurt]

@cgewecke Just upgraded both packages and the error keeps happening. Here is the stack error:

` Error: Bytecode is not a valid hex string

  at hashBytecode (node_modules/@openzeppelin/upgrades-core/src/version.ts:31:11)
  
  at hashBytecodeWithoutMetadata (node_modules/@openzeppelin/upgrades-core/src/version.ts:47:10)
  
  at getVersion (node_modules/@openzeppelin/upgrades-core/src/version.ts:14:24)
  
  at getUnlinkedBytecode (node_modules/@openzeppelin/upgrades-core/src/validate/query.ts:130:33)
  
  at getDeployData (node_modules/@openzeppelin/hardhat-upgrades/src/utils/deploy-impl.ts:48:47)
  
  at async deployProxyImpl (node_modules/@openzeppelin/hardhat-upgrades/src/utils/deploy-impl.ts:72:22)
  
  at async Proxy.deployProxy (node_modules/@openzeppelin/hardhat-upgrades/src/deploy-proxy.ts:35:28)
  
  at async deploySftMarketplaceContracts (test/fixtures/OriumSftMarketplaceFixture.ts:17:32)
  
  at async loadFixture (node_modules/@nomicfoundation/hardhat-network-helpers/src/loadFixture.ts:59:18)
  
  at async Context.<anonymous> (test/OriumSftMarketplace.test.ts:43:101)

`

[cgewecke]

@karacurt Sorry could you also update the zeppelin plugin packages - their latest is two major versions higher. It would be good to see all the relevant packages current before debugging since that's where the error originates.

https://github.com/OriumNetwork/orium-rental-marketplace-contracts/blob/e8dbe2bbe5978bb09177e1cbb83f14c97208c545/package.json#L32-L33

[cgewecke]

Am going close because in #870 the project is using deployProxy without problems and they're on the latest version. Issue is likely that deps are a couple years out of date in your project but if you continue to see this after bumping everything please ping and I'll re-open.