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UE（虚幻）学习（六）插件打包在UE5.3.2下Value cannot be null的错误

news 来源：原创 2025/5/21 7:56:00

自己写的插件打包出现了Unhandled exception: System.ArgumentNullException: Value cannot be null.的错误，发现只有UE5.3会报出。

D:\UE_5.3\Engine\Build\BatchFiles>Runuat.bat BuildPlugin -Plugin=F:\UEProjects\DQSDK5_3\Plugins\DQSDK\DQSDK.uplugin -Package=D:\1 -Rocket
Running AutomationTool...
Using bundled DotNet SDK version: 6.0.302
Starting AutomationTool...
Parsing command line: BuildPlugin -Plugin=F:\UEProjects\DQSDK5_3\Plugins\DQSDK\DQSDK.uplugin -Package=D:\1 -Rocket
Initializing script modules...
Total script module initialization time: 0.14 s.
Executing commands...
Copying 35 file(s) using max 64 thread(s)
Reading plugin from D:\1\HostProject\Plugins\DQSDK\DQSDK.uplugin...
Building plugin for host platforms: Win64
Running: D:\UE_5.3\Engine\Binaries\ThirdParty\DotNet\6.0.302\windows\dotnet.exe "D:\UE_5.3\Engine\Binaries\DotNET\UnrealBuildTool\UnrealBuildTool.dll" UnrealEditor Win64 Development -Project="D:\1\HostProject\HostProject.uproject" -plugin="D:\1\HostProject\Plugins\DQSDK\DQSDK.uplugin" -noubtmakefiles -manifest="D:\1\HostProject\Saved\Manifest-UnrealEditor-Win64-Development.xml" -nohotreload -log="C:\Users\Administrator\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+UE_5.3\UBT-UnrealEditor-Win64-Development.txt"
Log file: C:\Users\Administrator\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+UE_5.3\UBT-UnrealEditor-Win64-Development.txt
Total execution time: 2.18 seconds
Unhandled exception: System.ArgumentNullException: Value cannot be null. (Parameter 'element')at System.Attribute.GetCustomAttributes(MemberInfo element, Type attributeType, Boolean inherit)at System.Reflection.CustomAttributeExtensions.GetCustomAttributes[T](MemberInfo element)at UnrealBuildTool.ModuleRules.IsValidForTarget(Type ModuleType, ReadOnlyTargetRules TargetRules, String& InvalidReason) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\Configuration\ModuleRules.cs:line 1623at UnrealBuildTool.UEBuildTarget.AddAllValidModulesToTarget(ILogger Logger) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\Configuration\UEBuildTarget.cs:line 3886at UnrealBuildTool.UEBuildTarget.PreBuildSetup(ILogger Logger) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\Configuration\UEBuildTarget.cs:line 3354at UnrealBuildTool.UEBuildTarget.Create(TargetDescriptor Descriptor, Boolean bSkipRulesCompile, Boolean bForceRulesCompile, Boolean bUsePrecompiled, UnrealIntermediateEnvironment IntermediateEnvironment, ILogger Logger) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\Configuration\UEBuildTarget.cs:line 1366at UnrealBuildTool.BuildMode.CreateMakefileAsync(BuildConfiguration BuildConfiguration, TargetDescriptor TargetDescriptor, ISourceFileWorkingSet WorkingSet, ILogger Logger) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 1114at UnrealBuildTool.BuildMode.BuildAsync(List`1 TargetDescriptors, BuildConfiguration BuildConfiguration, ISourceFileWorkingSet WorkingSet, BuildOptions Options, FileReference WriteOutdatedActionsFile, ILogger Logger, Boolean bSkipPreBuildTargets) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 396at UnrealBuildTool.BuildMode.ExecuteAsync(CommandLineArguments Arguments, ILogger Logger) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\Modes\BuildMode.cs:line 252at UnrealBuildTool.UnrealBuildTool.Main(String[] ArgumentsArray) in D:\UE_5.3\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.cs:line 659
Took 2.33s to run dotnet.exe, ExitCode=6
UnrealBuildTool failed. See log for more details. (C:\Users\Administrator\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+UE_5.3\UBT-UnrealEditor-Win64-Development.txt)
AutomationTool executed for 0h 0m 3s
AutomationTool exiting with ExitCode=6 (6)
BUILD FAILED

解决办法：
在 Visual Studio 中打开 C:\Program Files\Epic Games\UE_5.4\Engine\Source\Programs\UnrealBuildTool\UnrealBuildTool.sln
使 Configuration/ModuleRules.cs 可写
找到 IsValidForTarget 方法
将第一行代码替换为下面的代码。

IEnumerable<TargetType> SupportedTargetTypes = new TargetType[] { };InvalidReason = string.Empty;try{SupportedTargetTypes = ModuleType.GetCustomAttributes<SupportedTargetTypesAttribute>().SelectMany(x => x.TargetTypes).Distinct();}catch{string moduleName = (ModuleType != null) ? ModuleType.Name : "<null>";InvalidReason = $"TargetType '{TargetRules.Type}' : Failed to get SupportedTargetTypesAttribute from '{moduleName}'";return false;}