Unreal Engine Visual Studio 2019 C++ – Could not open source file CoreMinimal.h

I’m trying to follow a YouTube tutorial and I’ve ran into this (Severity Code Description Project File Line Suppression State
Error (active) E1696 cannot open source file “CoreMinimal.h” Network2 E:Unreal ProjectsNetwork2SourceNetwork2MyClass.h 5 ) and a lot more errors, so if anybody has more experience than me with C++ please help me out.enter image description here