Project and Program crash down on PLAY

Hi everybody,

im learning and using UE4.18.2 and it has worked fine at the beginning few days ago. Last time i hit the play button it has crashed down and Windows has closed the program.
I just built a simple default example (the basic FPS) and it has crashed down too, so it’s happened something on the engine.

How can i solve this please?
Thank you very much in advance.