Sandbox private servers.

Hello, I’ve got a problem with a private server, recently, I have planned to play with my friend, created a server with only 2 player slots, so. My friend attempts to join a server but fails with a game crash, as he said, it just said “CAmanagerachievments” or something, I have no idea what does that thing means, its not something up to my addons, I checked it all over and over again.
Also, I am crashing on every GMod server, no idea why, I’ve got 180 addons, but I do not experience any CPU overloads or any FPS drops, it just crashes.
Here’s the GMod crash report.