Exception when opening the config GUI

[minoneer]

Please paste the output from /usb version below

Name: uSkyBlock
Version: 3.1.0-SNAPSHOT
Description: Ultimate SkyBlock v3.1.0-SNAPSHOT-3d7c820
Language: de (de)
State: d=100, r=50, i=9,485, p=83,334, n=false, awe=false
Server: Paper 1.21.3-81-da71382 (MC: 1.21.3)
State: online=true, bungee=true
------------------------------
Vault 1.7.3-b131 (ENABLED)
WorldEdit 7.3.9+6959-7adf70b (ENABLED)
WorldGuard 7.0.13-beta-1+2f13ae0 (ENABLED)
Multiverse-Core 4.3.1-CUSTOM-b3 (ENABLED)
Multiverse-NetherPortals 4.2.1-b786 (DISABLED)
------------------------------

What steps will reproduce the problem?

1. Type /usb config (with admin permissions)

If you have any log-files, please paste them

[11:40:54] [Server thread/ERROR]: Command exception: /usb config
org.bukkit.command.CommandException: Unhandled exception executing command 'usb' in plugin uSkyBlock v3.1.0-SNAPSHOT
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.command.brigadier.bukkit.BukkitCommandNode$BukkitBrigCommand.run(BukkitCommandNode.java:82) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at com.mojang.brigadier.context.ContextChain.runExecutable(ContextChain.java:73) ~[brigadier-1.3.10.jar:?]
at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:31) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.execution.tasks.ExecuteCommand.execute(ExecuteCommand.java:19) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.execution.UnboundEntryAction.lambda$bind$0(UnboundEntryAction.java:8) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.execution.CommandQueueEntry.execute(CommandQueueEntry.java:5) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.execution.ExecutionContext.runCommandQueue(ExecutionContext.java:103) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.Commands.executeCommandInContext(Commands.java:448) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.Commands.performCommand(Commands.java:355) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.Commands.performCommand(Commands.java:342) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.commands.Commands.performCommand(Commands.java:337) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.network.ServerGamePacketListenerImpl.performUnsignedChatCommand(ServerGamePacketListenerImpl.java:2241) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$11(ServerGamePacketListenerImpl.java:2215) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:154) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1578) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:207) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:128) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1555) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1548) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.util.thread.BlockableEventLoop.runAllTasks(BlockableEventLoop.java:117) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1505) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1345) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:340) ~[paper-1.21.3.jar:1.21.3-81-da71382]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.IllegalArgumentException: amount must be greater than 0
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:143) ~[guava-32.1.2-jre.jar:?]
at org.bukkit.inventory.ItemStack.of(ItemStack.java:59) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:138) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:117) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:104) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.menu.MenuItemFactory.createIntegerIcon(MenuItemFactory.java:53) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.menu.MenuItemFactory.createIntegerItem(MenuItemFactory.java:44) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.menu.MainConfigMenu.addSection(MainConfigMenu.java:310) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.menu.MainConfigMenu.addSection(MainConfigMenu.java:297) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.menu.MainConfigMenu.createFileMenu(MainConfigMenu.java:165) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.menu.MainConfigMenu.createEditMenu(MainConfigMenu.java:269) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.menu.ConfigMenu.showMenu(ConfigMenu.java:37) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.command.admin.ConfigCommand.execute(ConfigCommand.java:88) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.utils.command.CompositeCommand.execute(CompositeCommand.java:129) ~[uSkyBlock.jar:?]
at uSkyBlock.jar/us.talabrek.ultimateskyblock.utils.command.BaseCommandExecutor.onCommand(BaseCommandExecutor.java:42) ~[uSkyBlock.jar:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?]
... 26 more

[minoneer]

I'm not a fan of this config GUI in general - IMO editing the config file is just fine, and any server admin should be expected to know how to do so.