Warning: Attempt to modify property of non-object in joomla\components\com_jomcomment\mambots.php on line 142
I fixed the problem by editing the mambot.php file line by removing the & after the =
For example, the original line is:
142 $paramsData =& $params->_registry['_default']['data'];
and the edited line is:
142 $paramsData = $params->_registry['_default']['data'];
notice the & has been removed.