The system did not find an item with the SKU information provided in the request. Please verify the SKU is correct in Walmart systems, complete the item setup process, or reattempt the item setup request. Contact the support team at https://sellerhelp.walmart.com/s for further assistance with an item submission request. (Field Name: Inventory)
If you see this error on StoreAutomator for any product, you may either have deleted the relevant product from Walmart Seller Central or the SKU of the relevant product in Walmart Seller Central and the SKU on StoreAutomator may be different or you may be trying to list 2 different SKUs with the same product id.
To fix this problem, compare the relevant product's SKU in Walmart Seller Central and StoreAutomator and make sure they match. Also make sure there are no 2 different SKUs with the same product id.