i have a crash in gmod

Couldn’t load client.dll reason: unknown loaded fine in test.

Verify integrity of game cache, defrag, and restart computer.
If that doesnt work, reinstall garry’s mod.

I verified the integrity of the game cache and defragged the game, restarted pc, reinstalled gmod. this all started after the september 2015 update

Uninstall steam. Purge steam folder and it’s contents.