IL1005 error on System.Windows.Forms.dll

[BeboKhouja]

I was building my Unity game for IL2CPP on Windows, when I got this error:

Mono.Linker.LinkerFatalErrorException: ILLink: error IL1005: System.Windows.Forms.XplatUIX11.SetDisplay(IntPtr): Error processing method

On the editor, it works fine.

Full log:

Build completed with a result of 'Failed' in 15 seconds (15419 ms)
Building Library\Bee\artifacts\WinPlayerBuildProgram\ManagedStripped failed with output:
C:\Program Files\Unity\Hub\Editor\2022.3.46f1\Editor\Data\il2cpp\build\deploy\UnityLinker.exe @Library\Bee\artifacts\rsp\4096928808207462379.rsp
Fatal error in Unity CIL Linker
Mono.Linker.LinkerFatalErrorException: ILLink: error IL1005: System.Windows.Forms.XplatUIX11.SetDisplay(IntPtr): Error processing method 'System.Windows.Forms.XplatUIX11.SetDisplay(IntPtr)' in assembly 'System.Windows.Forms.dll'
---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'Mono.Posix, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'
at Unity.IL2CPP.Common.MissingMethodStubber.GetTypeModule(TypeReference type, IEnumerable`1 assemblies)
at Unity.Linker.Steps.AddUnresolvedStubsStep.MarkAssemblyOfType(UnityLinkContext context, TypeReference type)
at Unity.Linker.Steps.Marking.UnresolvedStubMarking.HandleUnresolvedType(TypeReference reference)
at Unity.Linker.Steps.UnityMarkStep.HandleUnresolvedType(TypeReference reference)
at Mono.Linker.Steps.MarkStep.MarkType(TypeReference reference, DependencyInfo reason, IMemberDefinition sourceLocationMember)
at Mono.Linker.Steps.MarkStep.MarkMethodBody(MethodBody body)
at Unity.Linker.Steps.UnityMarkStep.MarkMethodBody(MethodBody body)
at Mono.Linker.Steps.MarkStep.ProcessMethod(MethodDefinition method, DependencyInfo& reason)
at Unity.Linker.Steps.UnityMarkStep.ProcessMethod(MethodDefinition method, DependencyInfo& reason)
at Mono.Linker.Steps.MarkStep.ProcessQueue()
--- End of inner exception stack trace ---
at Mono.Linker.Steps.MarkStep.ProcessQueue()
at Mono.Linker.Steps.MarkStep.ProcessPrimaryQueue()
at Mono.Linker.Steps.MarkStep.Process()
at Unity.Linker.Steps.UnityMarkStep.Process(LinkContext context)
at Unity.Linker.UnityPipeline.ProcessStep(LinkContext context, IStep step)
at Mono.Linker.Pipeline.Process(LinkContext context)
at Unity.Linker.UnityDriver.UnityRun(UnityLinkContext context, UnityPipeline p, LinkRequest linkerOptions, TinyProfiler2 tinyProfiler, ILogger customLogger)
at Unity.Linker.UnityDriver.RunDriverWithoutErrorHandling(TinyProfiler2 tinyProfiler, ILogger customLogger)
at Unity.Linker.UnityDriver.RunDriverWithoutErrorHandling()
at Unity.Linker.UnityDriver.RunDriver()
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

I made sure everything was imported.

[rainfallgames]

I just fixed this in my project today.

I had to copy Mono.Posix and Mono.WebBrowser in to the plugins folder.

As an example, here's Mono.Posix: C:\Program Files\Unity\Hub\Editor\2022.3.49f1\Editor\Data\MonoBleedingEdge\lib\mono\gac\Mono.Posix\4.0.0.0__0738eb9f132ed756