Sophia here from Shopify. Welcome to the Shopify Community!
Are you using the Walmart Marketplace app? If so, I recommend emailing the app developer at WMA_Support@walmart.com.
I wish I could provide some insight on this error message, but it's not one that I've come across before. I trust that the app developer will be able to investigate further with you. If you reach a solution with them, please feel free to follow up here! I'm curious to know what's causing this and I'm sure the rest of the community would appreciate it too.
Sophia | Social Care @ Shopify
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