Bug in the manifest.xml file on line 43
$forum_head['ek_chatlitejs'] = '<script type="text/javascript" src="'.$ext_info['url'].'/media/js/chat.js?logged='.(($forum_user['is_guest']) ? 0 :(($forum_user['is_admmod']) ? 2 : 1)).'&baseUri='.$base_url.'/&extUri='.$ext_info['url'].'/"></script>';
change with
$forum_head['ek_chatlitejs'] = '<script type="text/javascript" src="'.$ext_info['url'].'/media/js/chat.js?logged='.(($forum_user['is_guest']) ? 0 :(($forum_user['is_admmod']) ? 2 : 1)).'&baseUri='.$base_url.'/&extUri='.$ext_info['url'].'/"></script>';