Shoutbox

Ok....I do the /nick then the CRTL + K  pick my colour and write my nick name.....and push enter.....But a window pops up asying

"Sorry, this command is either not reconised or an error occured during its processing. If the message was not suppose to be a command please type a double "//" at it's begining.

Thats what it tell me....So do i have setting wrong somewhere?! Or need to have something downloaded?!