CS:S MP5 Skin Invisible! HELP!

Hi, on Gmod when im using the CS:S weapon MP5, it’s invisible, nothing there, all other weapons i can see.
Here is the Error i get:
Error Vertex File for 'weapons\v_smg_mp5.mdl ’ checksum -1529060773 should be -1018881130
Please help, i use that gun alot! Thanks for reading this :slight_smile:

[editline]16th May 2012[/editline]

Anyone? Please :smiley: