Gmod crashes on startup...

It was working fine til this morning I went to go play and the game loads at first, but when you get that blue loading bar at the bottom of the screen telling you whats loading, It gets stuck at particles\dirty_explode.pfc then the game crashes saying hl2.exe. has stopped working… Any Ideas?

[editline]20th February 2012[/editline]

Nevermind, solved it by making a blank .pfc file in particles named dirty_explode