"Prop Limit Reached"

Basically, I create a listening server for me and a few friends to play on, but when I get on and try to spawn something, I am instantly hit with “Prop Limit Reached”. I tried doing sbox_maxprops <200> but had no luck.
So guys, any help would be much appreciated

EDIT: Ignore that, friend came up with a suggestion that worked.

Did you use sbox_maxprops <200> or sbox_maxprops 200 ?
The second variant is correct. The first isnt.