Error: XrCreatePixelSensor in the Magic Leap API failed. Reason: PixelSensorNotAvailableML

Unity Development
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1

Hello,

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Error: XrCreatePixelSensor in the Magic Leap API failed. Reason: PixelSensorNotAvailableML
Error: Unable to create sensor type: Depth Center

I occasionally encounter this error when configuring the pixel sensor, typically when my application doesn’t shut down properly or my cleanup code isn’t executed as expected.
I destroy the pixel sensor in both OnApplicationPause and OnDestroy, using the following call:
pixelSensorFeature.DestroyPixelSensor(sensorId);
However, this doesn’t seem to work reliably every time.

Once the error occurs, the sensor no longer works (even in the MagicLeap_Examples pixel sensor scene), and the only workaround I’ve found is rebooting the Magic Leap 2 device.

Is there any way to force a reset of a specific sensor to recover from this state without requiring a full reboot?

Give us as much detail as possible regarding the issue you’re experiencing:

Unity Editor version: 6000.0.38f1
ML2 OS version: 1.12.0
Unity SDK version: v2.6.0
Host OS: Windows 11 (23H2)

Error messages from logs

> 05-07 07:54:37.790 17790 17812 E Unity   : Error: XrCreatePixelSensor in the Magic Leap API failed. Reason: PixelSensorNotAvailableML 
> 05-07 07:54:37.790 17790 17812 E Unity   : UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
> 05-07 07:54:37.790 17790 17812 E Unity   : UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
> 05-07 07:54:37.790 17790 17812 E Unity   : UnityEngine.Logger:LogFormat(LogType, String, Object[])
> 05-07 07:54:37.790 17790 17812 E Unity   : UnityEngine.Debug:LogErrorFormat(String, Object[])
> 05-07 07:54:37.790 17790 17812 E Unity   : UnityEngine.XR.MagicLeap.MLPluginLog:ErrorFormat(String, Object[]) (at .\Library\PackageCache\com.magicleap.unitysdk@99d11877b11e\Runtime\Common\Utils\MLPluginLog.cs:154)
> 05-07 07:54:37.790 17790 17812 E Unity   : MagicLeap.OpenXR.Utils:DidXrCallSucceed(XrResult, String, Predicate`1, Boolean) (at .\Library\PackageCache\com.magicleap.unitysdk@99d11877b11e\Runtime\OpenXR\OpenXRUtils.cs:104)
> 05-07 07:54:37.790 17790 17812 E Unity   : MagicLeap.OpenXR.Features.PixelSensors.PixelSensor:CreatePixelSensor() (at .\Library\PackageCache\com.magicleap.unitysdk@99d11877b11e\Runtime\OpenXR\PixelSensors\MagicLeapPixelSensor.cs:60)
> 05-07 07:54:37.790 17790 17812 E Unity   : MagicLeap.OpenXR.Features.PixelSensors.MagicLeapPixelSensorFeature:CreatePixelSensor(PixelSensorId) (at .\Library\PackageCache\com.magi
> 05-07 07:54:37.790 17790 17812 W Unity   : [1669] Failed to create the 'Depth Center' sensor. Status Undefined.
> 05-07 07:54:37.790 17790 17812 W Unity   : UnityEngine.DebugLogHandler:Internal_Log(LogType, LogOption, String, Object)
> 05-07 07:54:37.790 17790 17812 W Unity   : UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
> 05-07 07:54:37.790 17790 17812 W Unity   : UnityEngine.Logger:Log(LogType, Object, Object)
> 05-07 07:54:37.790 17790 17812 W Unity   : UnityEngine.Debug:LogWarning(Object, Object)
> 05-07 07:54:37.790 17790 17812 W Unity   : AvatarMedical.<TryInitializeSensor>d__21:MoveNext() (at C:\Users\quent\Documents\ws\ScapulaOpenXR\Assets\Scripts\Recorder\CamerasRecorder.cs:238)
> 05-07 07:54:37.790 17790 17812 W Unity   : UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr) (at \home\bokken\build\output\unity\unity\Runtime\Export\Scripting\Coroutines.cs:17)
2

Do you try to get the status of the pixel sensor before creating it?

pixelSensor.GetSensorStatus(sensorId.Value)

3

Yes, it always remains in the Undefined state.

status = pixelSensorFeature.GetSensorStatus(sensorId);
Debug.Log($"[{Time.frameCount}] Creating the sensor '{sensorId}'... Status {status}.", context);
configure = pixelSensorFeature.CreatePixelSensor(sensorId);
if (configure)
{
    Debug.Log($"[{Time.frameCount}] The sensor '{sensorId}' has been created successfully.", context);
}
else
{
    Debug.LogWarning($"[{Time.frameCount}] Failed to create the '{sensorId}' sensor. Status {status}.", context);
}

This code works fine after a clean reboot, but if the application hasn’t shut down properly and the code to destroy the pixel isn’t called (for example, after an application crash), I can’t recover without rebooting the Magic Leap 2.

If necessary, I can try creating a minimal project that reproduces the problem.