Tags Problem

LamBaCini

i have a problem with tag. i trying to add a new topic but gives this error

" Tags can only contain unicode and the following ascii characters: a-z 0-9 + # _ . "

i add a pic -> http://img413.imageshack.us/img413/6792/tagproblem.jpg

LamBaCini

anyone help me ? its working on local but not working on server!