I wanted to submit my app for the App Store on iTunes Connect, but whatever I do I got this last message telling me there are still one or more errors on the page.
I was having this same issue and I literally tried all the above answers! I even tried submitting a new build thinking that might me the issue. But still it was showing the same error.
I contacted Apple Developer support multiple times and finally in the end I received a reply from them.
So there you go. This was my issue. And there was no way I could have figured this out without their email. I was practically thinking about giving up putting up the app on the iOS App Store.
In my case the last screenshots tab was not visible because of browser scale
So when I make zoom smaller it becomes visible
I had uploaded a new app v1.0 which got rejected. I updated the version to 1.0.1 in the plist and selected the correct version on App Store Connect. The problem I had was that my original app version was manually still listed as 1.0.
Changing that to 1.0.1 solved my problem.
Maybe you just forget the other Screenshots in the new Itunes Connect.
For me there was an extra language listed. However, in the drop-down list it was blank and there was no error indicating a problem. So it was hard to catch. Check out the screenshot. Once I deleted it is said the language was "Flemish" which I never even heard of.
My case was different when trying to submit a Newsstand app with an in-app purchase. Under the versions tab, I had to go to the in-app purchases section (NOT the in-app purchases tab) and add the free subscription I had configured to my build submission.