Getting a Placeholder Fatal Error

Hello,

This is a great module for what I am building for a client. My client needs a searchable table based off this view. However When I enable the Combine Filter Fields to use as a filter, I get this:

Fatal error: Call to undefined method views_xml_backend_plugin_query_xml::placeholder() in /var/www/csi-america/profiles/panopoly/modules/contrib/views/includes/handlers.inc on line 604

I have been racking my brain to try and solve it, but to no avail. This is a new one for me, but this is the code in views that is causing this error to shoot out:

  /**
   * Provides a unique placeholders for handlers.
   */
  function placeholder() {
    return $this->query->placeholder($this->options['table'] . '_' . $this->options['field']);
  }

UPDATE
What I was afraid of since this module does nto actually place the XML fields in the DB, you can not use a filter like this. I am going to write a function to do this and possibly a filter plugin to make this happen. Stay tuned....