Early Access for ARKit for iOS available now on GitHub

I have a problem after following your installation guide :

ERROR: UBT ERROR: Failed to produce item: /Applications/UE4.17/Engine/Binaries/Mac/UE4Editor.app/Contents/MacOS/UE4Editor-MetalRHI.dylib

What i did :

Download the Zip from the github
Open the stup and generate file
Build the ShaderCompileWorker and UnrealLightmass with the new Xcode Beta
Then Build the UE4 and get this error.
I tried to compile the SampleProject but same problem.

Thank you