Watchkit - how do I process icons for App Store submission?

I'm trying to upload a beta app that has a watch kit extension. I'm getting errors on three or four icons, that the store doesn't like. I completed the icon matrix:

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for watch and app. I have no warnings, and the app validates locally. I only get the errors after submission to the store. The errors are shown in the second image.

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Has anyone encountered this, and what steps should I take to remedy the issue.. I believe that WK submissions are now being accepted. Finally, I did visit the site mentioned in the error messages. Maybe I missed it, but I found no mention of icon errors.

Solution

There is an Images.xcassets-file in your WatchKit App-Folder. You have to fill this with the right images, not the one in your main app. Additionally, make sure that for every Image Set only 'Apple Watch' is chosen as the image target.

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