[deanhills]

[...] So i was using it on my wordpress site which was transferred from another server and i think the problem is due to mistake's during transfer.Now i think i should backup my contents manually and post it again.

Did you update the wp-options table of the database? There may be info in the database that need to be updated, i.e. https vs http etc.  I usually check through it in phpmyadmin after I manually migrated a database.