Unreal 5.5.4 + Meta XR v78 -> VR Preview does not work with Link

Development Platform & Builds XR Development
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Hi everyone,

I am new to this forum, and went through the discussions to try to figure out my problem. But to no avail, so here I start a new thread as it seems slightly different to the problems that others have (or more similar than I thing, but we will see).

I’m trying to make a basic VR application run in Unreal on the Meta Quest 3. I followed this link to setup everything, and I think that I have everything set up correctly.

For sure, starting this the VRTemplateMap provided in Unreal, I am able to compile the project as an apk for the Quest 3, copy it on the device, and run it directly from here.

I’m however running into problem as I also want to be able to run the application on the PC, and display it through the Link (tethered). This is necessary, as I’m working on a heavy application that will require to run on a desktop computer, not directly on the HMD.

However, as soon as I hit the VR Preview button, a static window opens, with a fixed view, and nothing is displayed in the HMD. I’ve looked around, but cannot seem to find what the problem might be.

For information, I get the following error message when hitting VR Preview

LogOVRPlugin: Error: [XRCMD][failure] [XR_ERROR_EXTENSION_DEPENDENCY_NOT_ENABLED]: xrCreateInstance(&createInfo, &instance), arvr\projects\integrations\OVRPlugin\Src\Util\CompositorOpenXR.cpp:4563 (arvr\projects\integrations\OVRPlugin\Src\Util/CompositorOpenXR.h:364)
LogOVRPlugin: Error: Plugin failed to initialize. (arvr\projects\integrations\OVRPlugin\Src\Util\CompositorOpenXR.cpp:2829)
LogOvrPlatform: Warning: Could not find ‘RiftAppId’ key in engine config. Trying ‘OculusAppId’. Move your oculus app id to ‘RiftAppId’ to use in your rift app and make this warning go away.
LogOvrPlatform: Error: Missing RiftAppId key in OnlineSubsystemOculus of DefaultEngine.ini
LogOVRPlugin: Error: [XRCMD][failure] [XR_ERROR_EXTENSION_DEPENDENCY_NOT_ENABLED]: xrCreateInstance(&createInfo, &instance), arvr\projects\integrations\OVRPlugin\Src\Util\CompositorOpenXR.cpp:4563 (arvr\projects\integrations\OVRPlugin\Src\Util/CompositorOpenXR.h:364)
LogOVRPlugin: Error: Plugin failed to initialize. (arvr\projects\integrations\OVRPlugin\Src\Util\CompositorOpenXR.cpp:2829)

Also I checked whether it might a problem with connecting through the link, but Meta Quest Link is well parametrized, and running another VR project that I have from the Unity Editor displays appropriately in the HMD through Link.

I was wondering whether anyone had an idea, as I seem to have tried everything I could encounter (including disactivating nanite, starting from an empty blank project, …)

Cheers

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In case anyone has a similar problem, here I share some of the steps I took to solve this problem.

As we had it running previously on other machines, I tried a clean full install on another computer, and the VR Preview worked, which made me suspect that it could be a problem with my computer. I therefore uninstalled fully all versions of Unreal, Meta Quest Link, and Android Studio, and fully restarted installing as mentioned in the documentation here

The good news is that after a clean install the VR Preview now works fine, so there was a problem with my installation. However building to apk then started to fail, with the following error

UATHelper: Packaging (Android (ASTC)): Expecting to find a type to be declared in a module rules named ‘OculusXRHMD’ in ‘UE5Rules, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null’. This type must derive from the ‘ModuleRules’ type defined by UnrealBuildTool.
UATHelper: Packaging (Android (ASTC)): Took 2,19s to run dotnet.exe, ExitCode=8
UATHelper: Packaging (Android (ASTC)): UnrealBuildTool failed. See log for more details.

I mention it here in case it can help others, but it looks like the problem came from the fact that I copied the MetaXR and MetaXRPlatform plugins directly into the Plugin folder of UE5_5 (C:\Program Files\Epic Games\UE_5.5\Engine\Plugins\), which used to work for me before. Instead, moving these folders into "C:\Program Files\Epic Games\UE_5.5\Engine\Plugins\Marketplace\ " solved the issue to build to Android apk

So in the end, uninstalling everything and restarting from a clean install solved the problem…

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