Thanks for posting about your experience here. The problem you described was occurring due to a technical issue that we became aware of which was blocking sellers from posting multi variation listings which use attributes as variants that would otherwise be required item specifics.
We just released a change to our site to correct this problem earlier today, so you should now be able to successfully post these items through Auctiva once again without encountering these errors.
We apologize for any inconveniences this issue may have caused. If you need any further assistance with your account, please contact our customer support team by mousing over the "Help" tab within your account and selecting the "File Support Case" option.