"Error: Shipping policy is required."

In order to list on eBay, you will need to set up your eBay business policies, which include a Shipping, Return, and Payment policy. Here is a link to opt in to the business policies; http://www.bizpolicy.ebay.com/businesspolicy/policyoptin 

Once you have set up your Shipping Policy, you will need to set the polices for the products. Here are the steps to adding a Shipping Policy to all products that do not have one assigned: 

1. Navigate to Settings > Listing Settings > Listing Defaults
2. Click the eBay logo
3. Choose a Shipping Policy from the Shipping Policy drop down menu
4. Click "Save"

Now you can then list the product(s) to your eBay storefront. 

**Remember, you can also upload the policy ID's in bulk through a .csv file upload**