Gmod9 not working.

[Gman9]

When I start Gmod9, It goes to the loading screen with a gravity gun and some paint cans. And after a few seconds, an error message comes up saying:

mountfilesystem( 241 ) failed: steamMountFilesystem(1596,241,0x1302fc74=,0x130fd74) failed
with error 5: no steam content servers are available

I have HL2 and HL2DM.

Note: You don't need all three games for Gmod9 to work. Only one Source engine game. This reads on the official site of Gmod.

Please help me!

 

[Rapstah]

You do need all three games, the one Source game refers to Gmod 10.

 

[giant384]

hl2,hl2dm, and css is what he is referring too^

 

[Munro]

You need to buy the games. Stop posting here.