I searched on google your error and I've found few information,
(1) This has no relation with any of Joomla Templates (also ours) or VM Themes.
(2) If your site can not run VirtueMart Live update system then you need to update it manually. Read this official VirtueMart Forum post for your ready reference: forum.virtuemart.net/index.php?topic=115877.msg394893#msg394893
(3) Read also here:
http://forum.virtuemart.net/index.php?topic=117038.0,
problems with VM always search on this forum, because we don't support VM
(4) Some people said it was connected with Akeeba products