Google play error "Please check the languages marked above for errors"

Problem is caused by a mandatory feature graphic, error code is misleading..

Ran into a similar issue today. Turns out, the promo video needs to include "http", "www" will show this misleading validation message.

What Tommo said. Apparently it is related to the recent changes to Google Play where a Featured image is required when making any changes to your listing.

Beginning August 31, 2014, you will be required to submit a Feature Graphic to update your app or Store Listing."

https://support.google.com/googleplay/android-developer/answer/6066610