I’ve been getting this error lately by simply loading into the singleplayer game. Immediately after or just before finishing loading, it crashes and shows this error.
Are you running any custom menus or mutli core rendering hacks?
I was using a .cfg that would activate some GMod multicore rendering command, but I removed that. I also checked the command and it was disabled as well.
It seems not all of it was disabled.
Huh. Perhaps the option in the menu might have something to do with it, too. I’ll check that out.
I fixed it by redoing my autoexec.cfg. I dunno’ which command it was but after replacing it completely, GMod worked fully again.