Help please

[Aftershocks]

Ok i recently had to redownload steam and everything cause had to whipe my computer or whatever dont have alot of time to type but i have a problem. I downloaded everything but now... it sais something about missing a nocollide or noclip file when i join this server? Can someone please help. Btw im not much of an rper but THIS SERVER OWNS. Ignore typos im quick typing needa eat.

[KingArthur]

Err thats an addon error? Im guessing... Try deleting your gmod folder and joining w/out any addons?