I\'m struggling to release a new version of our app using Xcode 9 built with iOS 11 SDK. Archiving and uploading the binary goes well without any issue. The build appears in
For anyone who the above answers did not help(spent a good bit of head-wall banging on this one):
Make sure to check the target membership of your assets directory! If you do not correctly link the membership here, you will get this same super-generic error(Apple should do something about the error messages).
The target membership should correlate directly to targets for which you are using the icons. For example, I use this single directory for both my main app, and watch app assets, you must specify this by selecting the appropriate member.
You do not need to edit the plist at all, most of these answers are misleading.
Hope this helps someone who hits this!