Thanks for contributing to our forum. I reviewed your account and it appears that eBay returned this error in response to your recent posting attempts because you selected the "Use eBay's domestic shipping rate table" but have not yet set up a domestic shipping rate table within your eBay account.
In order to be able to successfully post your listings with this option, you will first need to create a domestic shipping rate table within your eBay account as described on the following page of eBay's Help index:
On the other hand, you should also be able to post your items successfully if you uncheck the "Use eBay's domestic shipping rate table" option on the Auctiva lister page and stick with the basic Flat Rate or Calculated shipping options that are available.
I hope this helps. If you need any further assistance with your account, please feel free to contact our Customer Support team by mousing over the “Help” tab on our site and selecting the “File Support Case” option.