There are a few reasons why you might receive this error from Etsy:
You tried to push an “Active” products without accepting to pay Etsy fees.
You have special characters in your product card or description. Some quotation marks, for instance, generate an error from Etsy, despite all systems are now using UTF-8 sets.
Solution
Here are a couple of things to try to fix this error:
Make sure everything is set between you and Etsy, so that you can pay their fees.
Remove special characters from your listings and retry the publication.