Fatal Error - JTable (CiviMail direct URL entry for sending scheduled mailings)

I am trying to send my scheduled mailing by running the following URL in my browser. (* recreate correct passwords)

http://www.morvargh-sailing.co.uk/administrator/components/com_civicrm/civicrm/bin/civimail.cronjob.php?name=admin\&pass=******\&key=********

The scheduled mailing only has 130 recipients.

When it runs I am getting the following error...

Fatal error: Class 'JTable' not found in /home/fhlinux193/m/morvargh-sailing.co.uk/user/htdocs/administrator/components/com_civicrm/civicrm/CRM/Utils/System/Joomla.php on line 439

I am running Joomla 1.7.3 and Civi 4.1 Beta 2

Lobo asked that I create an Issue and post link back to forum post... http://forum.civicrm.org/index.php/topic,23082.0.html