TF 2 Models Bug

today when went to load my tf2 models in gmod i found that they where all black and had no colour to them has anyone else had this problem if so does anyone know how to fix it
thanks

screenshot

http://img21.imageshack.us/img21/694/gmconstruct0001t.jpg

as you can see he medic still has colour in on his ubercharger on his back but the rest are the same

Here you are:

thank you