Would anyone know why I keep getting this error:

Got ident response: "[aqpsMEToWDby/TJxnG5bVANgvnAqK41M]"
--- * Your username ([aqpsMEToWDby/TJxnG5bVANgvnAqK41M]) is invalid; please connect with your real username -- the part of your e-mail before the '@' -- in lowercase.