I also got that when I tried to run OMSI 2 via Windows Steam on macOS via Porting Kit.When i try load omsi 2 it comes with a german error. I looked at the log file it says something about Directx9 im running on Direct X12 windows 10.
====================Can you attach your log file for me, please?
Its still coming up with the same errorI can imagine.
Thank you for attaching that. Can you try going to the "_CommonRedist" folder within your OMSI 2 directory and going into "DirectX" > "Jun2010" and running "DXSETUP.exe" and see if that fixes it?
Still Not WorkingI would try verifying your game files (providing you have it on Steam) then. Let me know if you need help with this