Gmow and Vmod not working

I have several vehicle packs, but I cant get my Gmow or Vmod work, they spawn, but they seem to be invisible. And if you get in the car, screen goes black and you have to exit the server (singeplayer game)
So what’s the problem?
Can someone tell me and help, or give me full working gmod and vmod packs?

i don’t know but i tried to add vmod to my addons folder but the vehicle tab showed nothing new!

http://garrysmod-vehiclepack.googlecode.com/svn/trunk/

Second link is a download for a svn downloader

I just downloaded the SVN, and I’m still getting the same problem as the OP. Is there any way to fix this?

I’ve dled the svn and some cars still invisible.
Any help?