Problems with G-Mod

Every time I load up G-Mod it gets to the loading screen then closes itself to return me back to my desktop. This means that I am unable to play G-Mod and as it is one of my favorite games I would love some help to fix it thank you

(User was banned for this post ("Wrong section" - Ninja101))

right click garry’s mod in the library > properties > local files > verify integrity of game cache

Amplar, That does not work :U