you have to open up admin/applications_addon/other/tagss/xml/hook.xml and look up TagssModerateLib.php
<hook_data><![CDATA[a:7:{s:12:"dataLocation";s:0:"";s:15:"classToOverload";s:16:"moderatorLibrary";s:9:"skinGroup";N;s:12:"skinFunction";N;s:4:"type";N;s:2:"id";N;s:8:"position";N;}]]></hook_data>
to
<hook_data><![CDATA[a:8:{s:12:"dataLocation";s:0:"";s:14:"libApplication";s:6:"forums";s:15:"classToOverload";s:16:"moderatorLibrary";s:9:"skinGroup";N;s:12:"skinFunction";N;s:4:"type";N;s:2:"id";N;s:8:"position";N;}]]></hook_data>
and
class TagssModerateLib extends moderatorLibrary
to
class TagssModerateLib extends (~extends~)
save the file, then remove the hook in hook settings, then reinstall it.