This is a really strange problem that people are facing with the new version of XCode and macOS Sierra . There are several ways to resolve this error:
- Use the latest Xcode 8.2.1 and macOS Sierra 10.12.1 and download the archive from the new Xcode. Get the latest Xcode from here
- Archive your application, create an .ipa file with
Save for iOS App Store Deplyment and download it using Application Loader .
One of these options should work, as I ran into the same problem and fixed it by doing both of this for 2 times so far. I prefer # 1, since you do not need to use any other tool to load the assembly.
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