VS doesn't see any any generated files

[Unteroid]

After few months of work project refused to compile throwing

cannot open source file "xxx.generated.h"

In Every possible header my project have. I can’t build project or last successful configuration. Regenerating project sources does not help.
What could I do so entire project stopped working at once?

[Daekesh]

Try deleting your intermediate\build folder and then regenerating your project files.

[Unteroid]

I’ve done so, but no success unfortunately .