backup DB error

Hi,

I want to backup my DB, so I can upgrde to 1.3.0, but I get the following error, after I click the backup button.

Fatal error: Call to undefined method ModelToolBackup::export() in /home/swellinf/public_html/cart/admin/controller/tool/backup.php on line 72

It is being called from this url:
http://www.swellinfo.com/cart/admin/ind ... kup/export

PS. the backup/restore button images are missing the left side of the image.

Any help on this error?