iOS CI fails with "CoreUI: CUICatalog: couldn't get 'kMGArtworkGraphicsFeatureSetFallbacks' from MGCopyAnswer got"

Same here. I get 16400 warnings when I build with Xamarin Studio. I had no issues before upgrading XCode 7 and latest XS:

I have got small 13800 warnings out of this... as long as my reputation isn't high enough to comment questions (or answers) directly, I have to write in this way :(

I'm just glad at the moment, that I can work with my app on a device with the simulator.

Transfoming my project from Xamarin.iOS to unified API just didn't work out partly because of the missing "Migrate to Xamarin.iOS Unified API" (https://developer.xamarin.com/guides/cross-platform/macios/updating_ios_apps/) button in my Xamarin Studio and partly because the manually way to do this just had unsolvable problems with missing relations of my xibs in xCode.But that doesn't matter anyway because those warnings were there even when running into build errors with the unified API.

My build problems overall were solved thanks to this:Codesign error in Xamarin Studio 5.9.7 (build 9) and Xamarin.iOS 9.0.1.18

Any suggestions how to eliminate those warnings are highly welcome :)

I had the same issue plus the app would no longer launch in the simulator. I was able to fix this by changing the architecture from i386 to x86_64.

In Xamarin, it's under your project options -> Build -> iOS Build -> Advanced tab (on right) -> Supported architectures dropdown.