Messed up muzzleflash

recently i opened my gmod and found that the muzzleflashes for CSS is messed up.HL2 weapons works fine.The muzzle flash is like a small black square with a red dot or something in the middle. Can anyone post their muzzle flashes of their Gmod to here? I think its found in /Materials/Effects and called muzzleflash.vtf something. PLEASE HELP ME. I would appreciate if you post all your muzzleflashes file from Materials/Effects please i really need to fix this.

Delete the material and the CFG will automatically replace it.