It seems this bug happens because il2cpp.exe doesn't run correctly.

Repro:
1. Create a new project
2. Build UWP player with any build settings
3. Observe the error in Editor Console

Error (more info in the comments)
1. IL2CPP error (no further information about what managed code was being converted is available)
2. Failed running D:\Unity_Editors\2019.1.1f1\Editor\Data\il2cpp/build/il2cpp.exe --convert-to-cpp --emit-null-checks --enable-array-bounds-check --dotnetprofile="unityaot" --profiler-report --map-file-parser=D:/Unity_Editors/2019.1.1f1/Editor/Data/Tools/MapFileParser/MapFileParser.exe --directory=D:/Unity_Projects/Empty/Temp/StagingArea/Data/Managed --generatedcppdir=D:/Unity_Projects/Empty/Temp/StagingArea/Il2CppOutputProject/Source/il2cppOutput
3. Exception: D:\Unity_Editors\2019.1.1f1\Editor\Data\il2cpp/build/il2cpp.exe did not run properly!