Can you please verify that you are using the current Version of Jigoshop (1.9.2)and that you using the at least PHP version 5.3. Also please verify that you have properly configured the Google Product Feeds extension by watching https://www.youtube.com/watch?v=lzF-MkaTAEg
[Moderator Note: Please ensure that you are embedding links correctly in your posts. Link corrected.]