Library conflict in MacOS Catalina - UIFoundation vs AppKit I've installed the Beta3 of Catalina (and matching XCode) and my shell spews out this error whenever I open a terminal.

objc[1209]: Class NSDataAsset is implemented in both 
/System/Library/PrivateFrameworks/UIFoundation.framework/Versions/A/UIFoundation (0x112c97160) 
and 
/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (0x111d85028). 
One of the two will be used. Which one is undefined.


I understand if not everyone wants to dig into the details of the OS under the hood and I have reported this bug to Apple via Feedback Assistant but I want to understand the issue deeper.

I am not finding other posts about this which leads me to think that perhaps I have manually installed one of these frameworks it both of these framework native to Catalina.

How can I pick apart this error so I can learn how or why this error is logged?
macOS Catalina adds a lot of under the hood components to better support iOS on Mac apps. Both UIKit and AppKit are installed with macOS 10.15.

I haven't extensively tested the Catalina beta, but my best answer right now would be that it's still an early beta (beta 3 at the time of writing) and errors like this are to be expected. 

If you are testing an Xcode project on Catalina, I would assume that your app will (mostly) work correctly, but you should file a bug report if you come across any problems that you think may be a bug in the operating system or SDK.