"Cannot query; no document registered"

Hi there Jake - I just had a similar problem. Tried the 'Rebuild Thread Information' but no joy...

Here's the error:

An exception occurred: Cannot query; no document registered in /home/arsenalt/public_html/library/Zend/Dom/Query.php on line 239
Zend_Dom_Query->queryXpath() in Zend/Dom/Query.php at line 225
Zend_Dom_Query->query() in Waindigo/Library/Listener/TemplatePostRender.php at line 44
Waindigo_Library_Listener_TemplatePostRender->_threadPrefixEdit() in Waindigo/Library/Listener/TemplatePostRender.php at line 13
Waindigo_Library_Listener_TemplatePostRender->run() in Waindigo/Library/Listener/TemplatePostRender.php at line 22
call_user_func_array() in XenForo/CodeEvent.php at line 54
XenForo_CodeEvent::fire() in XenForo/Template/Abstract.php at line 195
XenForo_Template_Abstract->render() in XenForo/ViewRenderer/HtmlAdmin.php at line 116
XenForo_ViewRenderer_HtmlAdmin->renderContainer() in XenForo/FrontController.php at line 565
XenForo_FrontController->renderView() in XenForo/FrontController.php at line 156
XenForo_FrontController->run() in /home/arsenalt/public_html/admin.php at line 13
Now, I did move my entire site away from public_html for a short period, then pasted it all back in.... could that cause an issue? The rest of the site seems to work....