Unable to build with ARKit after Xcode update

Unity Engine
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1

I updated my macOS to Sonoma 14.0, which required Xcode update to version 15.0.
After updating to this version, I am no longer able to build my Unity app when Apple ARKit is enabled as a plug-in provider in Project Settings.
The build fails after 1-2 seconds and I’m getting this error:

ExecutionFailedException: Execution of actool failed with exit code 1. stderr:
UnityEditor.XR.ARKit.ACTool.Compile (System.String assetCatalogPath, System.String outputDirectory, System.Version minimumDeploymentTarget) (at ./Library/PackageCache/com.unity.xr.arkit@5.0.7/Editor/ACTool.cs:67)
UnityEditor.XR.ARKit.XcodeAssetCatalog.ToCar (System.Version minimumDeploymentTarget) (at ./Library/PackageCache/com.unity.xr.arkit@5.0.7/Editor/XcodeAssetCatalog.cs:89)
UnityEditor.XR.ARKit.ARResourceGroup.ToCar (System.Version minimumDeploymentTarget) (at ./Library/PackageCache/com.unity.xr.arkit@5.0.7/Editor/ARResourceGroup.cs:21)
UnityEditor.XR.ARKit.ARKitReferenceImageLibraryBuildProcessor+Preprocessor.BuildAssets () (at ./Library/PackageCache/com.unity.xr.arkit@5.0.7/Editor/ARKitReferenceImageLibraryBuildProcessor.cs:103)
UnityEditor.XR.ARKit.ARKitReferenceImageLibraryBuildProcessor+Preprocessor.UnityEditor.Build.IPreprocessBuildWithReport.OnPreprocessBuild (UnityEditor.Build.Reporting.BuildReport report) (at ./Library/PackageCache/com.unity.xr.arkit@5.0.7/Editor/ARKitReferenceImageLibraryBuildProcessor.cs:121)
UnityEditor.Build.BuildPipelineInterfaces+<>c__DisplayClass16_0.b__1 (UnityEditor.Build.IPreprocessBuildWithReport bpp) (at /Users/bokken/build/output/unity/unity/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:499)
UnityEditor.Build.BuildPipelineInterfaces.InvokeCallbackInterfacesPair[T1,T2] (System.Collections.Generic.List1[T] oneInterfaces, System.Action1[T] invocationOne, System.Collections.Generic.List1[T] twoInterfaces, System.Action1[T] invocationTwo, System.Boolean exitOnFailure) (at /Users/bokken/build/output/unity/unity/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:465)
UnityEngine.GUIUtility:processEvent(Int32, IntPtr, Boolean&) (at /Users/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:190)

If I disable ARKit as a plug-in provider, the build starts to work, but that’s not a solution for me.
I tried reinstalling Xcode and command line tools but that didn’t help. This doesn’t work in the ARFoundation sample repository (Unity 2022.3.10f1) as well.

2

Me too. I have upgraded to Unity 2022.3.11f1, but no success. Same error Xcode is not even opening.

3

As a workaround it does work if you do not use “Build and Run” but “Build” instead, and open it with Xcode 15 afterwards. I used Unity 2022.3.11f1 and AR Foundation 5.1.

4

I resolved the issue by installing the iOS 17.0 simulator through Xcode. While I was in the process of debugging the UnityEditor.XR.ARKit.ACTool.Compile() method, I noticed a brief message in some variable referring to a “missing device emulator.” Strangely, this message wasn’t displayed in the Unity Editor, which made the troubleshooting process quite challenging.

5

Make sure you’ve installed the command line tools for Xcode. This is how you’d normally get the actool.

6

I updated the Xcode to 15.3, macOS to 14.4, and iOS to 17.4.
And then this error happened when building a new Unity Project.

  • I just opened Xcode and random Xcode project
  • Attached iPhone via USB. Xcode suggested me to install iOS Simulator 17.0. I installed it.
  • I Built Project from Unity without any error. No command line tools for Xcode needed.
7

The AR Foundation Samples found here: GitHub - Unity-Technologies/arfoundation-samples: Example content for Unity projects based on AR Foundation
… do not exhibit this problem when built for ARKit with MacOS 14.4, XCode 15.2, and connected to an iOS 17.3 device.

I would recommend using that project as a point of reference to help isolate where the problem might be if you are still having this build issue.