Joomdle and Tienda purchasing items

Can I sell Moodle courses along side regular Tienda created items?

I get an XML-PRC Error(0) when purchasing Tienda created items. Moodle courses purchase ok.

The XML-Error comes at the end of the checkout process, after leaving paypal.

Delete, Joomdle and no error.

Thanks, dp

Is your joomdle install ok? ie: system check all green