WebGL IL2CPP.dll did not run properly

Unity Engine
1

when I build my game, I always getting this error. why?

Failed running /Applications/Unity/Unity.app/Contents/il2cpp/build/il2cppcore/il2cppcore.dll --convert-to-cpp --dotnetprofile="unityaot" --compile-cpp --libil2cpp-static --platform="WebGL" --architecture="EmscriptenJavaScript" --configuration="Release" --outputpath="/Users/wolkydj/Desktop/Unity Projects/FlipBook/Assets /../Temp/StagingArea/Data/Native/build.bc" --cachedirectory="/Users/wolkydj/Desktop/Unity Projects/FlipBook/Assets/../Library/il2cpp_cache" --compiler-flags="-Oz -DIL2CPP_EXCEPTION_DISABLED=1 " --emit-method-map --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_AIModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_ARModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_AccessibilityModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_AndroidJNIModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_AnimationModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_AssetBundleModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_AudioModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_ClothModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_CoreModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_CrashReportingModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_DSPGraphModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_DirectorModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_FileSystemHttpModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_GameCenterModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_GridModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_HotReloadModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_IMGUIModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_ImageConversionModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_InputLegacyModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_InputModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_JSONSerializeModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_LocalizationModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_ParticleSystemModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_PerformanceReportingModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_Physics2DModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_PhysicsModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_ProfilerModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_ScreenCaptureModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_SharedInternalsModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_SpriteMaskModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_SpriteShapeModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_StreamingModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_SubstanceModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_TLSModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_TerrainModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_TerrainPhysicsModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_TextCoreModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_TextRenderingModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_TilemapModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UIElementsModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UIModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UNETModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UmbraModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityAnalyticsModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityConnectModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityTestProtocolModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityWebRequestAssetBundleModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityWebRequestAudioModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityWebRequestModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityWebRequestTextureModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_UnityWebRequestWWWModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_VFXModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_VRModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_VehiclesModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_VideoModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_WebGLModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_WindModule_Dynamic.bc" --additional-libraries="/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/lib/modules/WebGLSupport_XRModule_Dynamic.bc" --profiler-report --map-file-parser="/Applications/Unity/Unity.app/Contents/Tools/MapFileParser/MapFileParser" --directory="/Users/wolkydj/Desktop/Unity Projects/FlipBook/Temp/StagingArea/Data/Managed" --generatedcppdir="/Users/wolkydj/Desktop/Unity Projects/FlipBook/Temp/StagingArea/Data/il2cppOutput"

stdout:
Building build.bc with EmscriptenToolChain
    Output directory: /Users/wolkydj/Desktop/Unity Projects/FlipBook/Temp/StagingArea/Data/Native
    Cache directory: /Users/wolkydj/Desktop/Unity Projects/FlipBook/Library/il2cpp_cache
il2cpp.exe didn't catch exception: Unity.IL2CPP.Building.BuilderFailedException: Traceback (most recent call last):
  File "/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emcc.py", line 30, in <module>
    import tempfile
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tempfile.py", line 32, in <module>
    import io as _io
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/io.py", line 51, in <module>
    import _io
ImportError: dlopen(/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so, 2): Symbol not found: __PyCodecInfo_GetIncrementalDecoder
  Referenced from: /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so
  Expected in: flat namespace
in /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so


Invocation was: Executable: /usr/bin/python
Arguments: -E "/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emcc" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -Wno-null-conversion -O3 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_AOT -DIL2CPP_MONO_DEBUGGER_DISABLED -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/Applications/Unity/Unity.app/Contents/il2cpp/libil2cpp" -I"/Applications/Unity/Unity.app/Contents/il2cpp/libil2cpp" -I"/Applications/Unity/Unity.app/Contents/il2cpp/external/bdwgc/include" -I"/Applications/Unity/Unity.app/Contents/il2cpp/external/xxHash" -I"/Users/wolkydj/Desktop/Unity Projects/FlipBook/Temp/StagingArea/Data/il2cppOutput" "/Users/wolkydj/Desktop/Unity Projects/FlipBook/Temp/StagingArea/Data/il2cppOutput/Il2CppTypeDefinitions.c" -o "/Users/wolkydj/Desktop/Unity Projects/FlipBook/Library/il2cpp_cache/462931B299C2CF93A2D729AFE7FFF8C1.o"

   at Unity.IL2CPP.Building.CppProgramBuilder.BuildAllCppFiles(IEnumerable`1 sourceFilesToCompile, IBuildStatisticsCollector statisticsCollector)
   at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
   at il2cpp.Program.DoRun(String[] args)
   at il2cpp.Program.Run(String[] args)
   at il2cpp.Program.Main(String[] args)
stderr:

Unhandled Exception: Unity.IL2CPP.Building.BuilderFailedException: Traceback (most recent call last):
  File "/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emcc.py", line 30, in <module>
    import tempfile
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tempfile.py", line 32, in <module>
    import io as _io
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/io.py", line 51, in <module>
    import _io
ImportError: dlopen(/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so, 2): Symbol not found: __PyCodecInfo_GetIncrementalDecoder
  Referenced from: /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so
  Expected in: flat namespace
in /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so


Invocation was: Executable: /usr/bin/python
Arguments: -E "/Applications/Unity/PlaybackEngines/WebGLSupport/BuildTools/Emscripten/emcc" -Wno-unused-value -Wno-invalid-offsetof -nostdinc -fno-strict-overflow -Wno-null-conversion -O3 -Oz -DIL2CPP_EXCEPTION_DISABLED=1  -DNET_4_0 -DUNITY_AOT -DIL2CPP_MONO_DEBUGGER_DISABLED -DGC_NOT_DLL -DRUNTIME_IL2CPP -DNDEBUG -I"/Applications/Unity/Unity.app/Contents/il2cpp/libil2cpp" -I"/Applications/Unity/Unity.app/Contents/il2cpp/libil2cpp" -I"/Applications/Unity/Unity.app/Contents/il2cpp/external/bdwgc/include" -I"/Applications/Unity/Unity.app/Contents/il2cpp/external/xxHash" -I"/Users/wolkydj/Desktop/Unity Projects/FlipBook/Temp/StagingArea/Data/il2cppOutput" "/Users/wolkydj/Desktop/Unity Projects/FlipBook/Temp/StagingArea/Data/il2cppOutput/Il2CppTypeDefinitions.c" -o "/Users/wolkydj/Desktop/Unity Projects/FlipBook/Library/il2cpp_cache/462931B299C2CF93A2D729AFE7FFF8C1.o"

   at Unity.IL2CPP.Building.CppProgramBuilder.BuildAllCppFiles(IEnumerable`1 sourceFilesToCompile, IBuildStatisticsCollector statisticsCollector)
   at Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics)
   at il2cpp.Program.DoRun(String[] args)
   at il2cpp.Program.Run(String[] args)
   at il2cpp.Program.Main(String[] args)
   at Program.Main(String[] args) in /Users/builduser/buildslave/unity/build/External/il2cpp/il2cpp/il2cppcore/Program.cs:line 24

UnityEngine.Debug:LogError(Object)
UnityEditorInternal.Runner:RunProgram(Program, String, String, String, CompilerOutputParserBase) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:126)
UnityEditorInternal.Runner:RunNetCoreProgram(String, String, String, CompilerOutputParserBase, Action`1) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:77)
UnityEditorInternal.IL2CPPBuilder:RunIl2CppWithArguments(List`1, Action`1, String) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:501)
UnityEditorInternal.IL2CPPBuilder:ConvertPlayerDlltoCpp(String, String, String, Boolean) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:484)
UnityEditorInternal.IL2CPPBuilder:Run() (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:334)
UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, IIl2CppPlatformProvider, Action`1, RuntimeClassRegistry) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/Il2Cpp/IL2CPPUtils.cs:70)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)
2

anybody help?