Crashing

[Scrabuz]

Well, yesterday evening I wanted to record a demo for an AR, but as soon as I finished loading the demo, my screen went black and my Gmod crashed. I tried it a few times, crash every time. I tried different methods of loading the map before (singleplayer, multiplayer) and verified the integrity of my game a few times, nothing helps. I'd appreciate if you could help me here.

Regards,
Scrabuz.