Hi, I have various listings and which to create a dozen or so more. When i submit the listing the following statement appears

"You are receiving this error as you may be adding Offer-Listing(s) or editing a SKU not present in your catalogue or one that’s been deleted. If this was a deleted SKU, wait 24 hours before resubmitting it. If you have tried to add this SKU to the Amazon catalogue before, check your data and correct any errors before resubmitting. If product is being added to a store from another one, it may require few hours for localisation before it is valid, please check your seller account for progress or any issues."

I have checked and double checked the listing and cant see any issue with it. They look pretty similar to listings i have already which gained approval a couple of years back. I don't believe it to be a SKU that's been deleted. Can anybody help me ?