559889 Add products to Google Shopping.

I have a Magento eCommerce store sh%op%cm%[login to view URL] (remove %) that needs 80 products added to Google. I've installed an extension: [login to view URL] It has migrated all my products already. But I am getting the error that it is: "Missing Unique Product Identifiers" And they are not searchable. I need this fixed ASAP, and I need an automatic feed where my products will always be updated in Google without error. Also, I need the products to be searchable and be complete on the Magento side so there are no issues when feeding into Google. This is a simple project that requires minor troubleshooting.