EP2 Not loading into gmod when installed on steam.

So today I was going to play this map that had some ep2 shit in it (Everything was ep2) and when I loaded it the map was full of purple and black checkers with error models EVERYWHERE. I have ep2 installed and played it a few times but when I try to mount it says “UNAVAILABLE” despite it working perfectly. I have already re-installed. And yes I did buy ep2 and gmod. Help?

I think Gmod mounting was messed up in a recent update or something :\ i know you said you had played it but have you run episode 2 since you re-installed it? That might help but i’m not entirely sure…

I played about 4 chapters of ep2 when I reinstalled.