WAW servers wont work and close game

[natedawg_907]

I'm experiencing a problem that I don't really understand I go to load into a zombies game and when it tries to load me in it tries to download the mods necessary for the servers but it get to the second bit of the download and closes the whole thing is there some way to fix this if there is please let me know asap as i was looking forward to playing WAW again.
Thank you for your time.