WebGL will not build due to UnusedByteCodeStripper2.exe

Questions & Answers
1

In short, I am getting this error when I’m trying to build a custom WebGL template (not made by me, and I know for a fact that the template works).

  1. "Failed running D:\Unity\Editor\Data\Tools/UnusedByteCodeStripper2/UnusedBytecodeStripper2.exe --api NET_2_0_Subset -out “D:\Unity\Quiz Game 1\Quiz Game 1\Quiz Game 1\Temp\StagingArea\Data\Managed empStrip” -l none -c link -b False -x “D:\Unity\Editor\Data\PlaybackEngines\WebGLSupport\Whitelists\Core.xml” -f “D:\Unity\Editor\Data\il2cpp\LinkerDescriptors” -x “D:\Unity\Quiz Game 1\Quiz Game 1\Quiz Game 1/Temp/StagingArea/Data/methods_pointedto_by_uievents.xml” -x “D:\Unity\Quiz Game 1\Quiz Game 1\Quiz Game 1\Temp\StagingArea\Data\preserved_derived_types.xml” -d “D:\Unity\Quiz Game 1\Quiz Game 1\Quiz Game 1\Temp\StagingArea\Data\Managed” -a “D:\Unity\Quiz Game 1\Quiz Game 1\Quiz Game 1\Temp\StagingArea\Data\Managed\Assembly-CSharp.dll” -a “D:\Unity\Quiz Game 1\Quiz Game 1\Quiz Game 1\Temp\StagingArea\Data\Managed\UnityEngine.UI.dll”

stdout:
SweepReport:
System.RuntimeType => Mono.Cecil.TypeDefinitionMono.Cecil.TypeDefinitionMono.Cecil.TypeDefinitionMono.Cecil.TypeDefinitionMono.Cecil.TypeDefinition
Mono.Cecil.MethodDefinition => System.Void .ctor()System.Void .ctor(System.String)System.String get_Comment()System.Void .ctor()System.Boolean get_CanTransformMultipleBlocks()
Mono.Cecil.FieldDefinition => System.String commentSystem.Func3<System.Int32,System.Int32,System.Int32> <>f__am$cache0System.Func3 <>f__am$cache1System.Func3<System.Double,System.Double,System.Double> <>f__am$cache2System.Func3 <>f__am$cache3
Fatal error in Mono CIL Linker
Mono.Cecil.ResolutionException: Failed to resolve UnityEngine.Profiler
at UnusedBytecodeStripper2.AddUnresolvedStubsStep.Process()
at Mono.Linker.Steps.BaseStep.Process(LinkContext context)
at Mono.Linker.Pipeline.Process(LinkContext context)
at Mono.Linker.Driver.RunDriver(Driver driver, IEqualityComparer1 typeComparer, IEqualityComparer1 methodComparer)
stderr:

UnityEngine.Debug:LogError(Object)
UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase, Action1) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:96) UnityEditorInternal.AssemblyStripper:RunAssemblyLinker(IEnumerable1, String&, String&, String, String) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:104)
UnityEditorInternal.AssemblyStripper:StripAssembliesTo(String, String, String, String, String&, String&, String, IIl2CppPlatformProvider, IEnumerable1, Boolean) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:97) UnityEditorInternal.AssemblyStripper:RunAssemblyStripper(String, IEnumerable, String, String[], String[], String, IIl2CppPlatformProvider, RuntimeClassRegistry, Boolean) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:196) UnityEditorInternal.AssemblyStripper:StripAssemblies(String, IIl2CppPlatformProvider, RuntimeClassRegistry, Boolean) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:128) UnityEditorInternal.IL2CPPBuilder:Run() (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:123) UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, IIl2CppPlatformProvider, Action1, RuntimeClassRegistry, Boolean) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:39)
UnityEditor.HostView:OnGUI()"

  1. “Exception: D:\Unity\Editor\Data\Tools/UnusedByteCodeStripper2/UnusedBytecodeStripper2.exe did not run properly!
    UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action1 setupStartInfo) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:98) UnityEditorInternal.AssemblyStripper.RunAssemblyLinker (IEnumerable1 args, System.String& out, System.String& err, System.String linkerPath, System.String workingDirectory) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:104)
    UnityEditorInternal.AssemblyStripper.StripAssembliesTo (System.String assemblies, System.String searchDirs, System.String outputFolder, System.String workingDirectory, System.String& output, System.String& error, System.String linkerPath, IIl2CppPlatformProvider platformProvider, IEnumerable1 additionalBlacklist, Boolean developmentBuild) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:97) UnityEditorInternal.AssemblyStripper.RunAssemblyStripper (System.String stagingAreaData, IEnumerable assemblies, System.String managedAssemblyFolderPath, System.String[] assembliesToStrip, System.String[] searchDirs, System.String monoLinkerPath, IIl2CppPlatformProvider platformProvider, UnityEditor.RuntimeClassRegistry rcr, Boolean developmentBuild) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:196) UnityEditorInternal.AssemblyStripper.StripAssemblies (System.String stagingAreaData, IIl2CppPlatformProvider platformProvider, UnityEditor.RuntimeClassRegistry rcr, Boolean developmentBuild) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/AssemblyStripper.cs:128) UnityEditorInternal.IL2CPPBuilder.Run () (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:123) UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String stagingAreaData, IIl2CppPlatformProvider platformProvider, System.Action1 modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry, Boolean developmentBuild) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:39)
    UnityEditor.WebGL.WebGlBuildPostprocessor.PostProcess (BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:560)
    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, UnityEditor.BuildReporting.BuildReport report) (at C:/buildslave/unity/build/Editor/Mono/BuildPipeline/PostprocessBuildPlayer.cs:186)
    UnityEditor.HostView:OnGUI()”

These are two errors that I’m getting.

2

Hope you get an answer I just started to have the same problem it was working then all of a sudden my comp crashed during a build and then it wouldn’t build correctly. So I decided to upgrade to 5.5.1f1 and then I started to get that error for my WebGL and I need it to work for me since the client is expecting the game in 2 days from me.

UPDATE: So after doing a lot more looking into the issue. I found out a few different things you can try. Make sure your .NET is set to 2.0 and not subset 2.0 (Build Settings → Player Settings → Other Settings). Also try deleting any plugins you have and re-importing them. It worked for me after doing those two things.