Fail to build on IL2CPP MacOS but builds ok for MacOS Mono

Hi, as per the above, can't build for Unity 2919.3.13 IL2CPP on macos, getting this error, I've tried to strip assets but can't narrow down what the problem is

someone can please shed some light so I can dig into it please, log doesn't say much to me:

Failed running /Applications/Unity/Hub/Editor/2019.3.13f1/Unity.app/Contents/il2cpp/build/deploy/il2cppcore/il2cppcore.dll --convert-to-cpp --emit-null-checks --enable-array-bounds-check --dotnetprofile="unityaot" --compile-cpp --libil2cpp-static --platform="MacOSX" --architecture="x64" --configuration="Release" --outputpath="/Users/projectname/Temp/StagingArea/Data/Native/GameAssembly.dylib" --cachedirectory="/Users/ projectname /Assets/../Library/il2cpp_cache" --incremental-g-c-time-slice=3 --profiler-report --map-file-parser="/Applications/Unity/Hub/Editor/2019.3.13f1/Unity.app/Contents/Tools/MapFileParser/MapFileParser" --directory="/Users/projectname Temp/StagingArea/Data/Managed" --generatedcppdir="/Users/ projectname /Temp/StagingArea/Data/il2cppOutput"



xception: /Applications/Unity/Hub/Editor/2019.3.13f1/Unity.app/Contents/il2cpp/build/deploy/il2cppcore/il2cppcore.dll 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 /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:128)

UnityEditorInternal.Runner.RunNetCoreProgram (System.String exe, System.String args, System.String workingDirectory, UnityEditor.Scripting.Compilers.CompilerOutputParserBase parser, System.Action`1[T] setupStartInfo) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildUtils.cs:77)

UnityEditorInternal.IL2CPPBuilder.RunIl2CppWithArguments (System.Collections.Generic.List`1[T] arguments, System.Action`1[T] setupStartInfo, Syst

In full log file there is a reference to:
Start importing Packages/com.unity.settings-manager/Editor/UserSettingsProvider.cs using Guid(0dc75b34a006d47f48c004031e6ef14d) Importer(-1,00000000000000000000000000000000)
Done importing asset: 'Packages/com.unity.settings-manager/Editor/UserSettingsProvider.cs' (target hash: 'acdc665f1c463c502b1655d90f80c76d') in 0.066604 seconds
Begin MonoManager ReloadAssembly
Symbol file LoadedFromMemory doesn't match image /projectname/Library/PackageCache/com.unity.ext.nunit@1.0.0/net35/unity-custom/nunit.framework.dll
Native extension for OSXStandalone target not found


And further down

Reloading assemblies after forced synchronous recompile.
Begin MonoManager ReloadAssembly
Symbol file LoadedFromMemory doesn't match image /Users/projectname/Library/PackageCache/com.unity.ext.nunit@1.0.0/net35/unity-custom/nunit.framework.dll
Native extension for OSXStandalone target not found
Refreshing native plugins compatible for Editor in 0.64 ms, found 1 plugins.


And also

Shader 'Universal Render Pipeline/Particles/Lit': fallback shader 'Universal Render Pipeline/Particles/SimpleLit' not found
RefreshInfo: StopAssetImportingV2(ForceSynchronousImport)
RefreshProfiler: Total: 12.828ms

 

Really nice from @lextm to clarify - mono winform is 32bit
https://github.com/gkngkc/UnityStandaloneFileBrowser/issues/83