No active UnityEngine.XR.ARSubsystems.XRSessionSubsystem is available.

Unity Engine
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Hello, I have started to develop an AR app using unity (currently using Unity 2022.2.9f1) and I get these warning messages every time I hit the play button:

No active UnityEngine.XR.ARSubsystems.XRSessionSubsystem is available. Please ensure that a valid loader configuration exists in the XR project settings.
UnityEngine.XR.ARFoundation.ARSession:OnEnable () (at ./Library/PackageCache/com.unity.xr.arfoundation@5.0.4/Runtime/ARFoundation/ARSession.cs:342)

No active UnityEngine.XR.ARSubsystems.XRCameraSubsystem is available. Please ensure that a valid loader configuration exists in the XR project settings.
UnityEngine.XR.ARFoundation.SubsystemLifecycleManager`3<UnityEngine.XR.ARSubsystems.XRCameraSubsystem, UnityEngine.XR.ARSubsystems.XRCameraSubsystemDescriptor, UnityEngine.XR.ARSubsystems.XRCameraSubsystem/Provider>:OnEnable () (at ./Library/PackageCache/com.unity.xr.arfoundation@5.0.4/Runtime/ARFoundation/SubsystemLifecycleManager.cs:68)

No active UnityEngine.XR.ARSubsystems.XRImageTrackingSubsystem is available. Please ensure that a valid loader configuration exists in the XR project settings.
UnityEngine.XR.ARFoundation.ARTrackableManager`5<UnityEngine.XR.ARSubsystems.XRImageTrackingSubsystem, UnityEngine.XR.ARSubsystems.XRImageTrackingSubsystemDescriptor, UnityEngine.XR.ARSubsystems.XRImageTrackingSubsystem/Provider, UnityEngine.XR.ARSubsystems.XRTrackedImage, UnityEngine.XR.ARFoundation.ARTrackedImage>:OnEnable () (at ./Library/PackageCache/com.unity.xr.arfoundation@5.0.4/Runtime/ARFoundation/ARTrackableManager.cs:104)

No active UnityEngine.XR.XRInputSubsystem is available. Please ensure that a valid loader configuration exists in the XR project settings.
UnityEngine.XR.ARFoundation.ARInputManager:OnEnable () (at ./Library/PackageCache/com.unity.xr.arfoundation@5.0.4/Runtime/ARFoundation/ARInputManager.cs:24)

I have installed XR plugins for both Android and iOs (AR Core and ARKit respectively) and upgraded to its latest versions. I also have the latest AR Foundation Package installed (5.0.4) and AR Subsystems (5.0.2) so I am not sure if this warnings affect to the development of the project or is something I shouldnā€™t be worried about.

Thank you in advance for the help.

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ARCore and ARKit are only available in built apps for their respective build targets (Android and iOS, respectively).

If you want to run your AR app in the Editor, check out XR Simulation: XR Simulation | AR Foundation | 5.0.7

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Or using the AR Foundation Remote plugin is also an option. As well as the Simulation feature, it allows running AR projects right inside the Editor.

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No answer on how to solve these error messages? I do get the warnings as well, when deployed to my IOS device (Iphone 14). When using the app on my phone Occlusion is not working even though I donā€™t have any warnings/ error messages besides the Subsystem ones.

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@fynnthecreator These warnings simply indicate that there is no subsystem available. This is not enough information to determine why.

As basic troubleshooting steps, make sure that your project configuration is valid. As another possibility, note that there is an open bug right now that requires that you make iOS builds from Unity on Mac. Building your Xcode project from Windows does not work with AR Foundation at the moment.

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I had the same problem after updating to 2022.3.1f1
In addition to the warnings, AR just wasnā€™t working for me.

Eventually ticking ā€˜Initialize XR on Startupā€™ made the problem go away.
Not sure why.

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7

When you are disabling this, you need to initialize it manually.
Otherwise, it happens automatically.

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Well, I have ticked the XR Simulation in Windows,Mac,Linux tab of XR Plug-in Management and then this warning goes away.

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I have this box already checked and am still getting that error, any other solutions?

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If you see it in Editor, then this is OK because your Mac/PC doesnā€™t have the needed sensors for AR. By default, the Simulation package is not installed. Also, you can use AR Foundation Remote for the convenient ā€œliveā€ development with your Phone. Some comparison info between different packages for testing you can find here.

Try to use Templates by Unity with AR Feature you need to avoid this issue, or my templates.

If you have your own customized project and see the issue in the build for some reason, then possibly your device canā€™t support AR features (iOS, Android), or you need to clean the build stuff:

  • delete library folder
  • clean build folder
  • delete the app on the phone completely (for iOS: without saving any info - step 2 in the removal process)
  • iOS: Delete Derived Data for your Project with the path like file:///Users/makaka.org/Library/Developer/Xcode/DerivedData/ā€¦
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Did you change your platform to iOS or Android in Build Settings?

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Go to Edit > Project Settings > XR Plug-in management > Windows, Mac, Linux Settings (Symbol looks like a monitor) then enable XR Simulation. That should solve it.

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Same here

14

Hi all, Iā€™m going to lock this thread. As I stated in my previous answer , ā€œNo subsystem availableā€ is a generic error message that can be caused by many different problems. Please create new posts for your specific issues with more information.

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I had the same issue, and it was solved when I changed the Active Input Handling from ā€˜Bothā€™ to ā€˜Input System Package (New).ā€™
Active Input Handling can be found in: Edit > Project Settings > Player > Other Settings.

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Thank you @francopasian999! That seems to solve my issue as well, Iā€™m working on a Quest 3 project