2019.3.0f6 IL2CPP build errors

I upgraded my project from 2019.2.16f1 to 2019.3.0f6 and now I can no longer build for Windows.
I get a lot of these error messages, which are hot helpful at all...

Code (CSharp):

1. Msvc Install Version: 15.0
2.     Msvc Install SDK Directory: C:\Program Files (x86)\Windows Kits\10
3.     Msvc Linker Path: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.22.27905\bin\HostX64\x64\link.exe
4.     Msvc Compiler Path: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.22.27905\bin\HostX64\x64\cl.exe
5.     Output directory: C:\Projects\STOR\Temp\StagingArea\Data\Native
6.     Cache directory: C:\Projects\STOR\Library\il2cpp_cache
7. il2cpp.exe didn't catch exception: Unity.IL2CPP.Building.BuilderFailedException: iRDSMain1.cpp
8. C:\Projects\STOR\Temp\StagingArea\Data\il2cppOutput\iRDSMain1.cpp(26494): error C2664: 'bool Behaviour_get_enabled_mAA0C9ED5A3D1589C1C8AA22636543528DB353CFB(Behaviour_tBDC7E9C3C898AD8348891B82D3E345801D920CA8 *,const RuntimeMethod *)': cannot convert argument 1 from 'GUITexture_t1679093D89FD7E758DB296145046F8BB10DB7E51 *' to 'Behaviour_tBDC7E9C3C898AD8348891B82D3E345801D920CA8 *'
9. C:\Projects\STOR\Temp\StagingArea\Data\il2cppOutput\iRDSMain1.cpp(26494): note: Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
10. C:\Projects\STOR\Temp\StagingArea\Data\il2cppOutput\iRDSMain1.cpp(26503): error C2664: 'void Behaviour_set_enabled_m9755D3B17D7022D23D1E4C618BD9A6B66A5ADC6B(Behaviour_tBDC7E9C3C898AD8348891B82D3E345801D920CA8 *,bool,const RuntimeMethod *)': cannot convert argument 1 from 'GUITexture_t1679093D89FD7E758DB296145046F8BB10DB7E51 *' to 'Behaviour_tBDC7E9C3C898AD8348891B82D3E345801D920CA8 *'
11. C:\Projects\STOR\Temp\StagingArea\Data\il2cppOutput\iRDSMain1.cpp(26503): note: Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
12. C:\Projects\STOR\Temp\StagingArea\Data\il2cppOutput\iRDSMain1.cpp(26520)