2.4 save UV faces export error

wene i tray to save my UV faces it gives me a error

is tha a bug or is my problem?

sorry for my bad English

edit:

http://img341.imageshack.us/img341/4487/untitled18sx.th.jpg

http://img319.imageshack.us/img319/1517/iviewcapturedate23122005time18.th.jpg