how do i fix this php error? [closed]

[GroownAncerce]

\[quote\] Fatal error: Call to a member function hooks_dp3rsSidebar() on a non-object in on line 63\[/quote\]and this is what on line 63:\[code\]return $this->registry->output->getTemplate( 'referrals' )->hooks_dp3rsSidebar( $this->referralsSystemLibrary->getTopXReferrers() );\[/code\]