GMOD crashes at startup

I played GMOD well few hours ago, but now, I launched GMOD, it crashed at loading with blue bar.
It says “Setting Convar Defaults” and after 1~2 seconds, it crashed and took me to desktop.
How can I fix this problem?

My computer has
Core 2 Quad Q6600 @2.4GHz
4 GB RAM
Radeon HD4870 1024MB
465GB Hard Disk(214GB left)
Windows Vista 32bit

For addon, I use
Achievements
Wire
Advanced Duplicator
Particle Controller
lens-flare
Model Manipulator
PHX3
Smart Weld
Smart Snap
Stacker
Unbreakable
UWSVN
Weight Stool
ULX
ULib

I am having the same exact problem.

EDIT: Fixed by restarting steam.

OMG it works for me too after restarting Steam.