You need to allow popups.
And no, our error check is a preliminary check of eBays most basic rules.
They have over 250+ pages of rules and each of those rules might be checking dozens or hundreds of things in your listings. We dont have access to those things because they dont provide them.
You have a word in your listing that eBay thinks is javascript code. The word cookie is the most common. If they gave us the list of words they don't like we could check for them and put it in our error check.
Remove chunks of your description until the item lists, then revise it to add back what you want on eBay leaving out the offending text they don't like.
You could also use our GetHTML feature on your saved listing and try listing this item on eBay directly pasting in the HTML into eBays source window in their HTML editor when you get to that point. The reason for trying that is to hope that eBay gives a better error message about the exact text that is causing the infraction on their site, than they give back to use through the API.