SKU does not exist in the Amazon catalog.
No action can be taken for the SKU you provided because that SKU does not exist in the Amazon catalog.
If you receive this error after submitting an inventory file, there are likely other errors associated with this SKU that block the successful addition of this SKU to the Amazon catalog. Check for and correct these errors. After you do so, this error message disappears.
If you receive this error after posting an image, pricing, or inventory feed (XML), you likely did not successfully add this product to the Amazon catalog using a product data feed. Check the processing reports for your product data feeds and correct any errors associated with this SKU.