My whole screen is black and purple

A while back when I wanted to join a server it looked that the whole screen was black and purple and I didn’t really know what to do so I just assumed it was because of the gamemode, I tried joining a roleplaying server (nutscript) when I decided to go back to gmod after alot of time of not playing but the issue continued and the whole screen is black and purple. I tried removing all gmod files and reinstalling gmod again, deleting all addons and all that but the problem is still here. I just have no idea how to fix it.

How it looks like.

When I press escape it looks fine.

you need to content pack for nutscript

[editline]27th April 2016[/editline]