what version of wow are you running with this? its been stated in previous posts that the best version to run is 2.0.12 all/most commands work in this version.
also if you have a later version and are unaware of how to downgrade to an earlier version, let me know and i will help you out.
And to GFX MIK3's post, you may be able to get into your server with 2.3, but i doubt any of the commands will work.