Fatal error: Call to undefined method JPagination::getPageNumber() on clicking user

Dear Team,

Getting the below error. when clicking on user.(http://grandsalute.com/discussions/users)


Fatal error: Call to undefined method JPagination::getPageNumber() in /home4/imran/public_html/administrator/components/com_easydiscuss/includes/easydiscuss.php on line 3327.


And also what to know how to remove the number in the mail subject.

Thanks,
Imran