Glitch Help...

Hey Guys. In Crossfire when i try to do the laboratory GM glitch as a Human it doesnt work. and when im about to get it , it said some kind of error thing and when i click ok, it makes me leave the game D:

Help?

( in laboratory GM i did the corner glitch . )
was it ctr-jump once.
then S and W ( with Ctr )
until u fall a little into the ground then you
run and press ctr.

You get probably a client error and that because almost all corner glitches are patched!