Need some help

[BJ]

Can someone help me ? I get this message short after trying to connect to warfare server, It's the first time i got this message...
https://imgur.com/a/MWz8OPg

Edit: Same on freon

[jiRNGen]

Maybe your nick isn't allowed

[Piglet]

Looks like it. That's the general "bad name" message. What was your player name?

[BJ]

oh, ok. Twas =>| :]  and I've changed it to  King due to weird glitches on my screen while displaying =>| :] on scoreboard

Edit:
My PC got bugged. I've formatted the computer and installed a different copy of ut. Problem solved