Build WEBGL Error in Unity 2019.3.3f1

Hi everyone I’ve been dealing with this error for one day, reading all the forums, answers to the base problem and versions that are supossed to be okey on build. I uninstalled all versions that i had, I’ve tried with some other versions and I finally give up on this pursuit.
Please help me with this problem.

This is the error that I have:

Failed running C:\Program Files\Unity\Editor\Data\il2cpp/build/deploy/net471/il2cpp.exe --convert-to-cpp --dotnetprofile=“unityaot” --compile-cpp --libil2cpp-static --platform=“WebGL” --architecture=“EmscriptenJavaScript” --configuration=“Release” --outputpath=“C:\Users\Administrador\New Unity Proj\Assets /…/Temp/StagingArea/Data\Native\build.bc” --cachedirectory=“C:\Users\Administrador\New Unity Proj\Assets..\Library/il2cpp_cache” --compiler-flags="-Oz -DIL2CPP_EXCEPTION_DISABLED=1 " --emit-method-map --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_AccessibilityModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_AIModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_AndroidJNIModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_AnimationModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_AssetBundleModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_AudioModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_ClothModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_CoreModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_CrashReportingModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_DirectorModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_DSPGraphModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_GameCenterModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_GridModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_HotReloadModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_ImageConversionModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_IMGUIModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_InputLegacyModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_InputModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_JSONSerializeModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_LocalizationModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_ParticleSystemModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_PerformanceReportingModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_Physics2DModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_PhysicsModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_ProfilerModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_ScreenCaptureModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_SharedInternalsModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_SpriteMaskModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_SpriteShapeModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_StreamingModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_SubstanceModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_SubsystemsModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_TerrainModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_TerrainPhysicsModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_TextCoreModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_TextRenderingModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_TilemapModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_TLSModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UIElementsModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UIModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UmbraModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UNETModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityAnalyticsModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityConnectModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityTestProtocolModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityWebRequestAssetBundleModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityWebRequestAudioModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityWebRequestModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityWebRequestTextureModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_UnityWebRequestWWWModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_VehiclesModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_VFXModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_VideoModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_VRModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_WebGLModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_WindModule_Dynamic.bc” --additional-libraries=“C:/Program Files/Unity/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\lib\modules\WebGLSupport_XRModule_Dynamic.bc” --profiler-report --map-file-parser=“C:/Program Files/Unity/Editor/Data/Tools/MapFileParser/MapFileParser.exe” --directory=“C:/Users/Administrador/New Unity Proj/Temp/StagingArea/Data/Managed” --generatedcppdir=“C:/Users/Administrador/New Unity Proj/Temp/StagingArea/Data/il2cppOutput”

stdout:
Building build.bc with EmscriptenToolChain
Output directory: C:\Users\Administrador\New Unity Proj\Temp\StagingArea\Data\Native
Cache directory: C:\Users\Administrador\New Unity Proj\Library\il2cpp_cache
il2cpp.exe didn’t catch exception: Unity.IL2CPP.Building.BuilderFailedException: Traceback (most recent call last):
File “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py”, line 37, in
from tools import shared, jsrun, system_libs, client_mods, js_optimizer
File “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten ools\shared.py”, line 10, in
import multiprocessing
File “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten_Win\python\2.7.5.3_64bit\lib\multiprocessing_init_.py”, line 84, in
import _multiprocessing
ImportError: DLL load failed: %1 no es una aplicaci?n Win32 v?lida.

Invocation was: Executable: “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten_Win\python\2.7.5.3_64bit\python.exe”
Arguments: -E “C:\Program Files\Unity\Editor\Data\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"C:\Program Files\Unity\Editor\Data\il2cpp\libil2cpp" -I"C:\Program Files\Unity\Editor\Data\il2cpp\libil2cpp" -I"C:\Program Files\Unity\Editor\Data\il2cpp\external\bdwgc\include" -I"C:\Program Files\Unity\Editor\Data\il2cpp\external\xxHash" -I"C:\Users\Administrador\New Unity Proj\Temp\StagingArea\Data\il2cppOutput" “C:\Users\Administrador\New Unity Proj\Temp\StagingArea\Data\il2cppOutput\Il2CppTypeDefinitions.c” -o “C:\Users\Administrador\New Unity Proj\Library\il2cpp_cache\FE107ED11849F9ED6598120CC3D8305A.o”

en Unity.IL2CPP.Building.CppProgramBuilder.BuildAllCppFiles(IEnumerable1 sourceFilesToCompile, IBuildStatisticsCollector statisticsCollector) en Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics) en il2cpp.Program.DoRun(String[] args, List1 foundAssemblies)
en il2cpp.Program.Run(String args, Boolean setInvariantCulture)
en il2cpp.Program.Main(String args)
stderr:

Excepci�n no controlada: Unity.IL2CPP.Building.BuilderFailedException: Traceback (most recent call last):
File “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py”, line 37, in
from tools import shared, jsrun, system_libs, client_mods, js_optimizer
File “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten ools\shared.py”, line 10, in
import multiprocessing
File “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten_Win\python\2.7.5.3_64bit\lib\multiprocessing_init_.py”, line 84, in
import _multiprocessing
ImportError: DLL load failed: %1 no es una aplicaci?n Win32 v?lida.

Invocation was: Executable: “C:\Program Files\Unity\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten_Win\python\2.7.5.3_64bit\python.exe”
Arguments: -E “C:\Program Files\Unity\Editor\Data\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"C:\Program Files\Unity\Editor\Data\il2cpp\libil2cpp" -I"C:\Program Files\Unity\Editor\Data\il2cpp\libil2cpp" -I"C:\Program Files\Unity\Editor\Data\il2cpp\external\bdwgc\include" -I"C:\Program Files\Unity\Editor\Data\il2cpp\external\xxHash" -I"C:\Users\Administrador\New Unity Proj\Temp\StagingArea\Data\il2cppOutput" “C:\Users\Administrador\New Unity Proj\Temp\StagingArea\Data\il2cppOutput\Il2CppTypeDefinitions.c” -o “C:\Users\Administrador\New Unity Proj\Library\il2cpp_cache\FE107ED11849F9ED6598120CC3D8305A.o”

en Unity.IL2CPP.Building.CppProgramBuilder.BuildAllCppFiles(IEnumerable1 sourceFilesToCompile, IBuildStatisticsCollector statisticsCollector) en Unity.IL2CPP.Building.CppProgramBuilder.Build(IBuildStatistics& statistics) en il2cpp.Program.DoRun(String[] args, List1 foundAssemblies)
en il2cpp.Program.Run(String args, Boolean setInvariantCulture)
en il2cpp.Program.Main(String args)

UnityEngine.Debug:LogError(Object)
UnityEditorInternal.Runner:RunProgram(Program, String, String, String, CompilerOutputParserBase)
UnityEditorInternal.Runner:RunManagedProgram(String, String, String, CompilerOutputParserBase, Action1) UnityEditorInternal.IL2CPPBuilder:RunIl2CppWithArguments(List1, Action1, String) UnityEditorInternal.IL2CPPBuilder:ConvertPlayerDlltoCpp(Il2CppBuildPipelineData, String, String, Boolean) UnityEditorInternal.IL2CPPBuilder:Run() UnityEditorInternal.IL2CPPUtils:RunIl2Cpp(String, IIl2CppPlatformProvider, Action1, RuntimeClassRegistry)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

Exception: C:\Program Files\Unity\Editor\Data\il2cpp/build/deploy/net471/il2cpp.exe did not run properly!
UnityEditorInternal.Runner.RunProgram (UnityEditor.Utils.Program p, System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser) (at <9a184ab867bb42c296d20ace04f48df3>:0)
UnityEditorInternal.Runner.RunManagedProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action1[T] setupStartInfo) (at <9a184ab867bb42c296d20ace04f48df3>:0) UnityEditorInternal.IL2CPPBuilder.RunIl2CppWithArguments (System.Collections.Generic.List1[T] arguments, System.Action1[T] setupStartInfo, System.String workingDirectory) (at <9a184ab867bb42c296d20ace04f48df3>:0) UnityEditorInternal.IL2CPPBuilder.ConvertPlayerDlltoCpp (UnityEditor.Il2Cpp.Il2CppBuildPipelineData data, System.String outputDirectory, System.String workingDirectory, System.Boolean platformSupportsManagedDebugging) (at <9a184ab867bb42c296d20ace04f48df3>:0) UnityEditorInternal.IL2CPPBuilder.Run () (at <9a184ab867bb42c296d20ace04f48df3>:0) UnityEditorInternal.IL2CPPUtils.RunIl2Cpp (System.String stagingAreaData, UnityEditorInternal.IIl2CppPlatformProvider platformProvider, System.Action1[T] modifyOutputBeforeCompile, UnityEditor.RuntimeClassRegistry runtimeClassRegistry) (at <9a184ab867bb42c296d20ace04f48df3>:0)
UnityEditor.WebGL.WebGlBuildPostprocessor.CompileBuild (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:387)
UnityEditor.WebGL.WebGlBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args) (at /Users/builduser/buildslave/unity/build/PlatformDependent/WebGL/Extensions/Unity.WebGL.extensions/BuildPostprocessor.cs:929)
UnityEditor.Modules.DefaultBuildPostprocessor.PostProcess (UnityEditor.Modules.BuildPostProcessArgs args, UnityEditor.BuildProperties& outProperties) (at <9a184ab867bb42c296d20ace04f48df3>:0)
UnityEditor.PostprocessBuildPlayer.Postprocess (UnityEditor.BuildTargetGroup targetGroup, UnityEditor.BuildTarget target, System.String installPath, System.String companyName, System.String productName, System.Int32 width, System.Int32 height, UnityEditor.BuildOptions options, UnityEditor.RuntimeClassRegistry usedClassRegistry, UnityEditor.Build.Reporting.BuildReport report) (at <9a184ab867bb42c296d20ace04f48df3>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

UnityEditor.BuildPlayerWindow+BuildMethodException: 3 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x00275] in <9a184ab867bb42c296d20ace04f48df3>:0
at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in <9a184ab867bb42c296d20ace04f48df3>:0
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

I have Unity 2019.3.3f1 with WebGL Platform installed. Visual Studio 2017 Professional

Thank you in advance ^ ^

any solutions so far ? I am facing same issue on Unity 2019 and 2018 on ubuntu webgl build

Same issue here. Can not build WebGl on obuntu 20.04