I searched for some fixes but none of the searches helped me at all.
In the admin section I get these errors when clicking particular links

Advertisement:
Fatal error: require() [function.require]: Failed opening required 'Pager/Pager.php' (include_path='.:/home/name/public_html/include/:/home/name/public_html/include/PEAR/:.:/usr/lib/php:/usr/local/lib/php') in /home/name/public_html/admin/advertisements.php on line 52

All Users/Active/Inactive

Fatal error: require() [function.require]: Failed opening required 'Pager/Pager.php' (include_path='.:/home/name/public_html/include/:/home/name/public_html/include/PEAR/:.:/usr/lib/php:/usr/local/lib/php') in /home/name/public_html/admin/users.php on line 59

Same for EVERY link in Video Management, Channels, Group mang, Email Templates,

It all adds up to the Pager.php file,..

Help cuz it seems pretty simple but I just cant get it