Here's the problem...
Fatal error: Cannot access protected property JToolBar::$_name in /home/<user>/public_html/administrator/components/com_jcomments/classes/button/jcommentspopup.php on line 27
To fix it, just open the file above and change this:
function fetchId($type = 'JCommentsPopup', $name)
{
if (defined('JPATH_PLATFORM')) {
return $this->_parent->getName() . '-' . $name;
} else {
return $this->_parent->_name . '-' . $name;
}
}
To this:
function fetchId($type = 'JCommentsPopup', $name)
{
return $this->_parent->getName() . '-' . $name;
}
If you're not comfortable editing JComments code, upgrading your Joomla installation is your only other option.