FATAL ERROR! Half-Life 1 Thread

I'm making a mod for half-life 1. My directory is setup correctly and everything, but when i go to start a new game at the main menu the game crashes and shows this message: Mod_NumForName: C:/Program Files/Steam/steamapps/poisonyou96/half-life/s.w.a.t/not found. Ive been having a lot of problems lately, but those were all easy fixes. This one is more confusing and i don't even know were to start.

BTW: I have googled it and no solution has been found.