[support] Error Trying To Move Files To New Hosting Company

I am trying to move some of my sites to a new hosting company. I did a backup of Drupal on the old hosting company and tried uploading it on the new hosting company. This is the error message I am getting. *Fatal error*: Call to undefined function: filter_xss_bad_protocol() in * /home/rob/public_html/mobile/includes/common.inc* on line *837*