How to fix Visual Studios error?

I get this when trying to open a C++ file in my project, a brand new near blank one. One I have not begun to edit yet.

Never seen that before…

May want to reinstall visual studio.

@GamesByH Try deleting/renaming this folder:


I’ll do that.

How did you even get this idea? I deleted it but it was 14.0 not 15.0 and it still gave the same error.