Predefined type 'System.Object' is not defined or imported .net 4.6

Question

I\'m using MVC 5 and .net 4.6 to create a web API that my mobile app can connect too.

Whenever I build the project I get hundreds of errors telling me that I need to add

Answer 1

I have the same problem. I spent 2 day to resolve this problem. I try reinstall visual, clear cache visual, uninstall visual or setup windows 10 again => but not success.

You can try follow step, it success for me

1. Close visual
2. Delete packages folder in solution folder
3. Open visual and rebuild solution

Good luck