IL2CPP issue (Unity 5.1.0f3) [SOLVED]

Unity Engine
,
1

Hi,

I’m attempting to build the project using IL2CPP, and receive an error with UnusedBytecodeStripper2.exe

The Editor.log shows:

stdout:
Fatal error in Mono CIL Linker
Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'CSharp, Culture=neutral, PublicKeyToken=null'
  at Mono.Linker.LinkContext.Resolve (IMetadataScope scope) [0x00000] in <filename unknown>:0 
  at Mono.Linker.Steps.ResolveFromXmlStep.GetAssembly (Mono.Linker.LinkContext context, System.String assemblyName) [0x00000] in <filename unknown>:0 
  at Mono.Linker.Steps.ResolveFromXmlStep.ProcessAssemblies (Mono.Linker.LinkContext context, System.Xml.XPath.XPathNodeIterator iterator) [0x00000] in <filename unknown>:0 
  at Mono.Linker.Steps.ResolveFromXmlStep.Process () [0x00000] in <filename unknown>:0 
  at Mono.Linker.Steps.BaseStep.Process (Mono.Linker.LinkContext context) [0x00000] in <filename unknown>:0 
  at Mono.Linker.Pipeline.Process (Mono.Linker.LinkContext context) [0x00000] in <filename unknown>:0 
  at Mono.Linker.Driver.Run () [0x00000] in <filename unknown>:0 
  at Mono.Linker.Driver.RunDriver (Mono.Linker.Driver driver) [0x00000] in <filename unknown>:0 
stderr:

UnityEngine.Debug:Internal_Log(Int32, String, Object)
UnityEngine.Debug:LogError(Object)
UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:66)
UnityEditorInternal.AssemblyStripper:RunAssemblyLinker(IEnumerable`1, String&, String&, String, String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:192)
UnityEditorInternal.AssemblyStripper:StripAssembliesTo(String, String, String&, String&, String, String, IEnumerable`1) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:185)
UnityEditorInternal.AssemblyStripper:Strip(String, String, String&, String&, String, String, IEnumerable`1) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:136)
UnityEditorInternal.AssemblyStripper:Strip(String[], String[], String, String, String&, String&, String, String, IEnumerable`1) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:121)
UnityEditorInternal.IL2CPPBuilder:RunAssemblyStripper(IEnumerable, String, String[], String[], String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:433)
UnityEditorInternal.IL2CPPBuilder:StripAssemblies(String[], String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:421)
UnityEditorInternal.IL2CPPBuilder:Run() (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:273)
UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:211)
UnityEditor.iOS.PostProcessiPhonePlayer:PostProcess(iOSBuildPostprocessor, BuildTarget, String, String, String, String, String, String, String, BuildOptions, RuntimeClassRegistry)
UnityEditor.iOS.iOSBuildPostprocessor:PostProcess(BuildPostProcessArgs)
UnityEditor.PostprocessBuildPlayer:Postprocess(BuildTarget, String, String, String, Int32, Int32, String, String, BuildOptions, RuntimeClassRegistry) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:316)
UnityEditor.BuildPipeline:BuildPlayerInternalNoCheck(String[], String, BuildTarget, BuildOptions, Boolean, UInt32&)
UnityEditor.BuildPlayerWindow:BuildPlayerWithDefaultSettings(Boolean, BuildOptions, Boolean) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:618)
UnityEditor.BuildPlayerWindow:BuildPlayerWithDefaultSettings(Boolean, BuildOptions) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:444)
UnityEditor.BuildPlayerWindow:GUIBuildButtons(IBuildWindowExtension, Boolean, Boolean, Boolean, BuildPlatform) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:1415)
UnityEditor.BuildPlayerWindow:ShowBuildTargetSettings() (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:1361)
UnityEditor.BuildPlayerWindow:OnGUI() (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:1009)
System.Reflection.MonoMethod:InternalInvoke(Object, Object[], Exception&)
System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
System.Reflection.MethodBase:Invoke(Object, Object[]) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView:Invoke(String, Object) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:185)
UnityEditor.HostView:Invoke(String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:178)
UnityEditor.HostView:OnGUI() (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:74)

(Filename: /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs Line: 66)

Exception: /Applications/Unity/Unity.app/Contents/Frameworks/Tools/UnusedByteCodeStripper2/UnusedBytecodeStripper2.exe did not run properly!
  at UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser) [0x000e6] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:68 
  at UnityEditorInternal.AssemblyStripper.RunAssemblyLinker (IEnumerable`1 args, System.String& out, System.String& err, System.String linkerPath, System.String workingDirectory) [0x00034] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:192 
  at UnityEditorInternal.AssemblyStripper.StripAssembliesTo (System.String outputFolder, System.String workingDirectory, System.String& output, System.String& error, System.String linkerPath, System.String descriptorsFolder, IEnumerable`1 additionalBlacklist) [0x001b5] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:185 
  at UnityEditorInternal.AssemblyStripper.Strip (System.String outputFolder, System.String workingDirectory, System.String& output, System.String& error, System.String monoLinkerPath, System.String descriptorsFolder, IEnumerable`1 additionalBlacklist) [0x00007] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:136 
  at UnityEditorInternal.AssemblyStripper.Strip (System.String[] assemblies, System.String[] searchDirs, System.String outputFolder, System.String workingDirectory, System.String& output, System.String& error, System.String monoLinkerPath, System.String descriptorsFolder, IEnumerable`1 additionalBlacklist) [0x00000] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:121 
  at UnityEditorInternal.IL2CPPBuilder.RunAssemblyStripper (IEnumerable assemblies, System.String managedAssemblyFolderPath, System.String[] assembliesToStrip, System.String[] searchDirs, System.String monoLinkerPath) [0x00028] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:433 
  at UnityEditorInternal.IL2CPPBuilder.StripAssemblies (System.String[] assemblies, System.String managedAssemblyFolderPath) [0x0001f] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:421 
  at UnityEditorInternal.IL2CPPBuilder.Run () [0x00057] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:273 
  at UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String tempFolder, System.String stagingAreaData, IIl2CppPlatformProvider platformProvider, System.Action`1 modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) [0x0000c] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:211 
  at UnityEditor.iOS.PostProcessiPhonePlayer.PostProcess (UnityEditor.iOS.iOSBuildPostprocessor pp, BuildTarget target, System.String stagingAreaData, System.String stagingArea, System.String stagingAreaDataManaged, System.String playerPackage, System.String installPath, System.String companyName, System.String productName, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry) [0x00000] in <filename unknown>:0 
  at UnityEditor.iOS.iOSBuildPostprocessor.PostProcess (BuildPostProcessArgs args) [0x00000] in <filename unknown>:0 
  at UnityEditor.PostprocessBuildPlayer.Postprocess (BuildTarget target, System.String installPath, System.String companyName, System.String productName, Int32 width, Int32 height, System.String downloadWebplayerUrl, System.String manualDownloadWebplayerUrl, BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry) [0x000c5] in /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:316 
UnityEditor.BuildPipeline:BuildPlayerInternalNoCheck(String[], String, BuildTarget, BuildOptions, Boolean, UInt32&)
UnityEditor.BuildPlayerWindow:BuildPlayerWithDefaultSettings(Boolean, BuildOptions, Boolean) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:618)
UnityEditor.BuildPlayerWindow:BuildPlayerWithDefaultSettings(Boolean, BuildOptions) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:444)
UnityEditor.BuildPlayerWindow:GUIBuildButtons(IBuildWindowExtension, Boolean, Boolean, Boolean, BuildPlatform) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:1415)
UnityEditor.BuildPlayerWindow:ShowBuildTargetSettings() (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:1361)
UnityEditor.BuildPlayerWindow:OnGUI() (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPlayerWindow.cs:1009)
System.Reflection.MonoMethod:InternalInvoke(Object, Object[], Exception&)
System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:222)
System.Reflection.MethodBase:Invoke(Object, Object[]) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Reflection/MethodBase.cs:115)
UnityEditor.HostView:Invoke(String, Object) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:185)
UnityEditor.HostView:Invoke(String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:178)
UnityEditor.HostView:OnGUI() (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:74)

(Filename: /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs Line: 68)

Error building Player: Exception: /Applications/Unity/Unity.app/Contents/Frameworks/Tools/UnusedByteCodeStripper2/UnusedBytecodeStripper2.exe did not run properly!

Any idea how to solve it?

Thanks.

2

@Stilf

This error is generated by the IL code stripper, which is always used with IL2CPP (stripping is always enabled) to minimize build sizes. It is difficult to tell what is causing this issue from this error message alone. This error means that something in your project (either script code or an assembly) is referencing some code in an assembly named CSharp, but that assembly is not found in the project.

Do you know what might be referencing this assembly? It might be useful to use a tool like ILSpy to investigate the assemblies in the project to help understand their references.

3

@JoshPeterson
Thanks for the reply.

I work on OSX (attempting to make a build for iOS) so I can’t use ILSpy. I read online that Monodevelop can be used as well.

Attaching a screenshot of where I’m looking at. Is it the right place? As none of them has csharp listed under ‘References’:

4

@Stilf

Yes, this is the correct place to look. It seems that an assembly named CSharp is not referenced here, you are correct. Is it possible for you to submit a bug along with this project? We may have a problem with the IL2CPP stripping code here.

5

@JoshPeterson
I submitted the project. Case #707893

6

@Stilf

Thanks, we will investigate this bug.

7

@JoshPeterson
Was this bug looked into? Do you estimate a solution can take place in the next release of Unity?
In WebGL builds il2cpp is mandatory.

8

@Stilf

No, unfortunately this bug has not yet been investigated. I apologize for the delay, we will try to have a look at it soon.

9

This issue has been resolved.
For those interested, the build failed because the file link.xml contained:

instead of: