Vuforia HoloLens Sample crash on HoloLens but not in Unity

Unity Engine
1

Hello,

I’m using Unity 2018.4.10.f1 and i download the Vuforia HoloLens Sample from the Store and imported it into an empy project.
When i test it in Unity by using my Mac webcam (i’m running windows 10 with Bootcamp) everything work fine: the models like the Astronaut or the Drone are built into the sample images when i show it to my webcam.

The problems come when i build the project on VisualStudio 2019 and running it on my HoloLens.
The app opens but i can’t see the models when i look at the sample images with the HoloLens.
Furthemore, while the debugging i get this errors in console:

Exception generated at 0x76EB2DE2 (KernelBase.dll) in Test.exe: WinRT source error - 0xC00DABE0: “No acquisition device available.”.
cameraDeviceStartCamera

And when i look at the sample image instead of the models spawning i get this:

Trackable Astronaut NO_POSE – UNKNOWN
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[ ])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
DefaultTrackableEventHandler:OnTrackableStateChanged(Status, Status)
Vuforia.TrackableBehaviour:RegisterTrackableEventHandler(ITrackableEventHandler)
DefaultTrackableEventHandler:Start()
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug.bindings.h Line: 45)
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\Windows.Media.Speech.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\BCP47Langs.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\Speech_OneCore\Common\sapi_onecore.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\winmmbase.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\Windows.Globalization.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\BCP47mrm.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\FlightSettings.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\bcd.dll’ completato. Simboli caricati.
onecoreuap\enduser\nui\onecore\sapi\sapi\sr\srcloudpolicy.cpp(255)\sapi_onecore.dll!6405937A: (caller: 640597B1) ReturnHr(1) tid(fe4) 80070005 Access is denied.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\Speech_OneCore\Common\SpeechServiceWinRTApi.ProxyStub.dll’ completato. Simboli caricati.
‘Test.exe’ (Win32): caricamento di ‘C:\Windows\System32\Speech_OneCore\Engines\SR\spsrx_onecore.dll’ completato. Simboli caricati.
Trackable Drone NO_POSE – UNKNOWN
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[ ])
UnityEngine.Logger:Log(LogType, Object)
UnityEngine.Debug:Log(Object)
DefaultTrackableEventHandler:OnTrackableStateChanged(Status, Status)
Vuforia.TrackableBehaviour:RegisterTrackableEventHandler(ITrackableEventHandler)
DefaultTrackableEventHandler:Start()
(Filename: C:\buildslave\unity\build\Runtime/Export/Debug.bindings.h Line: 45)

Furthermore, if i launch the app on the HoloLens withouth running it on VisualStudio i can see the splash screen and the app close.

2

So this is just a guess, but did you enable the all UWP Capabilities (Permissions) in your VS project? In addition to Webcam and Microphone, you may need to add enable “Gaze Input”, which is a new Capability.

The error “No acquisition device available.” seems to indicate the app cannot access the camera or some other device; possibly due to missing app permissions.

3

Hello @timke (& @Sika_MC )

I also got some issues with Unity, Vuforia and HoloLens…

I want to create an app in Unity where I want to use both Mixed Reality Toolkit (MRTK v2) and Vuforia (only ImageTargets).

I manage to get the Vuforia Sample to work and successfully deploy to HoloLens 1 through Visual Studio, but I can’t create an own new project in Unity with ImageTargets.

The supported Vuforia Engine was downloaded together with Unity. I have created a new Unity project and imported MRTK v2. I just want to create a simple scene to get the ImageTarget-functionality to work, so I have an AR camera, an image (from my DB which is created and downloaded from Vuforia Developer Portal) and a 3D object above the image. The build on Unity succeeds without any error messages, the same for Visual Studio to the HoloLens. Might also be worth to mentioning that I deploy the app to HoloLens remotely.

The problem is that the app crashes directly after the deployment. It last at maximum of 3 seconds before the whole app crashes in HoloLens.

I really don’t understand why? The same thing happens regardless of whether I use MRTKv2 or not.

Unity: 2018.4.16f1
Visual Studio Community 2019: 16.4.2
Vuforia: 8.3.8

Thank you in advance!

4

We need a crash dump in order to identify the problem. Please refer to Microsoft’s documentation on debugging HoloLens apps and collecting crash dumps:
https://docs.microsoft.com/en-us/visualstudio/debugger/using-dump-files?view=vs-2019
https://docs.microsoft.com/en-us/windows/mixed-reality/using-the-windows-device-portal#app-crash-dumps
You can also try debugging yourself by launching the app using Visual Studio, i.e. using F5.

Finally, I strongly recommend you seek help from Microsoft’s “HoloDevelopers” Slack channel, which you can join via this link: https://holodevelopersslack.azurewebsites.net/
They will be able to better help with MR specific issues.