I also got the error -[MTLDebugDevice newLibraryWithURL:error:]:2250: failed assertion `url must not be nil.'
My version of Xcode is 14.3, I used Simulator iOS 16.2.
The error went away when I started using Simulator iOS 16.4.
RomanSundurov1
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The issue is still unresolved (Xcode 14.2) and is preventing us from making a good interface.