Hello Louwrens Vorster !

The 25 and 27 lines of template/scripts/BxBaseCmtsPageView.php 

$oCmts = BxDolCmts::getObjectInstance($sSystem, $iObjectId, true);

$sObjectTitle = bx_process_output(strip_tags($oCmts->getObjectTitle($iObjectId)));

You error means that object $oCmts hasn't been created. It may cause by the wrong name of the $sSystem variable (doesn't exist in your UNA) or something wrong with the files path on your server (but it may be visible on other pages too).

So you need to restore all your steps before the error's appearance. BTW - on what page you see it now?