Cart variant was not found and no fallback found

[jpadkins]

I keep getting this issue when customers add books into their cart.  http://fanstore.myawesomefans.com

[jenkinhill]

"Cart variant was not found and no fallback found" is not a language string in the curent version of VirtueMart - what was the actual message?   http://forum.virtuemart.net/index.php?topic=79799.0