1. Create Unity WebGL build with 'development' checkbox checked.
2. Unity console shows following error after attempting a build:

Failed running "C:/Program Files/Unity/Hub/Editor/2019.3.9f1/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\Emscripten_Win\python\2.7.5.3_64bit\python.exe" -E "C:/Program Files/Unity/Hub/Editor/2019.3.9f1/Editor/Data/PlaybackEngines/WebGLSupport\BuildTools\Emscripten\emcc" @"C:\Users\stons\Source\MBI.CustomerSelect.Unity\MBI.CustomerSelect.Unity\MBI.CustomerSelect.Unity.Project\Assets..\Temp\emcc_arguments.resp"

stdout:
stderr:warning: unexpected number of arguments 1 in call to '__cxa_pure_virtual', should be 0warning: unexpected number of arguments 2 in call to '_ZN6il2cpp6icalls8mscorlib6System6String22RedirectToCreateStringEv', should be 0warning: unexpected number of arguments 4 in call to '_ZN6il2cpp6icalls8mscorlib6System6String22RedirectToCreateStringEv', should be 0warning: unexpected number of arguments 5 in call to '_ZN6il2cpp6icalls8mscorlib6System6String22RedirectToCreateStringEv', should be 0warning: unexpected number of arguments 4 in call to '_ZN6il2cpp6icalls8mscorlib6System6String22RedirectToCreateStringEv', should be 0warning: unexpected number of arguments 2 in call to '_ZN6il2cpp6icalls8mscorlib6System6String22RedirectToCreateStringEv', should be 0warning: unexpected number of arguments 3 in call to
'_ZN6il2cpp6icalls8mscorlib6System6String22RedirectToCreateStringEv', should be 0

error: unresolved symbol: Noesis_RenderDeviceMTL_SetOffScreenCommandBuffer
error: unresolved symbol: Noesis_RenderDeviceMTL_SetOnScreenEncoder
error: unresolved symbol: Noesis_RenderDevice_CreateMTL

Aborting compilation due to previous errors | undefinedTraceback (most recent call last): File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py", line 3063, in <module> sys.exit(run()) File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emcc.py", line 1780, in run final = shared.Building.emscripten(final, append_ext=False, extra_args=extra_args) File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\shared.py", line 2274, in emscripten emscripten._main(cmdline) File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2233, in _main return temp_files.run_and_clean(lambda: main( File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\tempfiles.py", line 93, in run_and_clean return func() File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2238, in <lambda> DEBUG=DEBUG, File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 2164, in main temp_files=temp_files, DEBUG=DEBUG) File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 86, in emscript glue, forwarded_data = compiler_glue(metadata, libraries, compiler_engine, temp_files, DEBUG) File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 218, in compiler_glue glue, forwarded_data = compile_settings(compiler_engine, libraries, temp_files) File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\emscripten.py", line 541, in compile_settings cwd=path_from_root('src'), error_limit=300) File "C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\tools\jsrun.py", line 132, in run_js raise Exception('Expected the command ' + str(command) + ' to finish with return code ' + str(assert_returncode) + ', but it returned with code ' + str(proc.returncode) + ' instead! Output: ' + str(ret)[:error_limit])Exception: Expected the command ['C:/Program Files/Unity/Hub/Editor/2019.3.9f1/Editor/Data\Tools\nodejs\node.exe', '--stack_size=8192', '--max-old-space-size=4096', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\compiler.js', 'C:\Users\stons\AppData\Local\Temp\tmpw7_08y.txt', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Audio.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Cursor.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Eval.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\FileSystem.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Logging.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Profiler.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\SystemInfo.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\UnetWebSocket.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\Video.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\WebCam.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\WebRequest.js', 'C:\Program Files\Unity\Hub\Editor\2019.3.9f1\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\Emscripten\src\library_pthread_stub.js'] to finish with return code 0, but it returned with code 1 instead! Output: // The Module object: Our interface to the outside world. We import// and export values on it. There are various ways Module can be used:// 1. Not defined. We create it here// 2. A function parameter, function(Module) { ..generated code.. }// 3. pre-run appended it, var Module = {}; ..generated
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)