fatal error on previous entries… (using wphpp)

i recieve the following fatal error when trying to go to previous entries…

Fatal error: Call to a member function on a non-object in /home/msjerile/public_html/forum/includes/bbcode.php on line 46

i believe it has something to do with wphpbb.

the code that is located at line 46 is as follows:

$tpl_filename = $template->make_filename(‘bbcode.tpl’);

anyhelp or suggestions?