wp-Jalali Calender plugin

Hi guys !

1st I gotta say this plugin turns wp date and time to persian. it works with many themes very well but not with mine ! I have just purchased Classipress theme which is really useful but as I install wp-Jalali plugin suddenly everything disappears !!! both dashboard and the website !

I got disappointed with asking people all around the net ! no1 knows the solution to this strange problem! if I can not show the date in Persian Calender then I have to forget my theme !

Thanx for ur help in advance