Why PhpStorm inspection says `Exception` is undefined?

Question

PhpStorm doesn't recognize Exception from some reason. The code executes fine, but I cannot "go to" code (which should send me to Core_c.php):

Answer 1

Windows OS has "try rebooting the OS" advice which helps in a lot of "does not work / suddenly stopped working" scenarios.

File | Invalidate Caches is the one for PhpStorm, especially after IDE/OS crash or after upgrading your IDE to a newer version.

P.S. I had to make up some text, otherwise it's too short for an answer.