An item with the specified Product ID does not exist in our catalog. Please submit a Full Setup for the item. For more details, review this Help article:
What does it mean?
This error occurs when you try to list an SKU with a Product ID that is not existing in the Walmart catalog by using the fast listing feature on StoreAutomator.
To fix this error, disable the fast listing feature of this SKU. If you have a template for the category to which this SKU belongs, assign it to this SKU, or create a new template and complete the template mapping. At the end of all this, select the related SKU, force product data update, and Sync the channel.