That means there’s an error with your listings and so the listing fees can’t be received from the eBay system.
Can you please give this a try?:
There is a combination of things that need to be resolved - you need keychain access permissions set on the login detail for Garage Sale within the Keychain access utility. Your Mac password is normally the one that will let you set authorisations.
Then delete the user/account details under GS>Preferences>accounts. Close GS again
Then you have to go back to the login details on the Keychain Access utility for all the eBay tokens and delete these.
At this point you should have GS application with no users, - use the + button to add your user back into the GS application - signing in to eBay as you go
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