Getting XR_ERROR_HANDLE_INVALID error when tracking

Magic Leap Remote Rendering 1.16.92
Unreal Plugin 1.8
UE 5.4.4
ML2 OS 1.110

This is a follow up to this thread, which is closed.

Hi. I'm trying to track Aruco markers. I have it working and can get the headset to identify a marker, but I'm getting the following errors every tick:

LogMagicLeapMarkerTracking: Error: Tick: xrGetMarkerDetectorStateML failure XR_ERROR_HANDLE_INVALID
LogMagicLeapMarkerTracking: Error: Tick: xrGetMarkerDetectorStateML failure XR_ERROR_HANDLE_INVALID
LogMagicLeapMarkerTracking: Error: Tick: xrGetMarkerDetectorStateML failure XR_ERROR_HANDLE_INVALID
LogMagicLeapMarkerTracking: Error: Tick: xrGetMarkerDetectorStateML failure XR_ERROR_HANDLE_INVALID

This error occurs both tethered and via WiFi.

Do you know what is causing this?

I would upload my log but this interface doesn't let me upload .txt files.