Custom fields: I am not able save my custom fields value!!

[JoomlaHelp8]

Hello,

Okays, this is what happening here, I want additional / custom fields under my product page from joomla backend. And, if I try to do the same I am not able to save them actually...every time I try and save it ... redirects me to the main page of virtue mart.

Screenshot below : when I am trying to add my custom fields for my products : http://screencast.com/t/A6xbD0mz

this what happen when I try to save them redirects  me back to this page : http://screencast.com/t/qbuBZc6WVSL