Unable to find an entry point named 'CheckLibraryHasLoaded' in DLL 'SpectatorViewPlugin'

[bdunajczyk]

Hello everyone. Recently I tried to compile SpectatorView example which comes with MixedRealityToolkit unfortunately without success. I did all of the steps introduced at:
https://github.com/Microsoft/MixedRealityToolkit/tree/master/SpectatorViewPlugin
After adding above plugin to the SpectatorView project, another issues popped up, which I solved looking at:
microsoft/MixedRealityToolkit-Unity#1867
At last application compiled and got deployed on HoloLens but after launching I got this error:

System.EntryPointNotFoundException: Unable to find an entry point named 'CheckLibraryHasLoaded' in DLL 'SpectatorViewPlugin'.
   at HoloToolkit.Unity.SpectatorView.OpenCVUtils.CheckOpenCVWrapperHasLoaded()
   at HoloToolkit.Unity.SpectatorView.SpectatorViewNetworkDiscovery.Awake()

And I'm stuck. Does anyone know how to solve this problem? Unity sees SpectatorViewPlugin.dll as native dll instead of managed but I don't know if it has something to do with the error.
Thanks, regards,
Błażej

[keveleigh]

This sounds like an issue that was inadvertently introduced last week, but should have been fixed in microsoft/MixedRealityToolkit-Unity#2168, which made its way into the most recent RC release. If you try the lastest May branch or the latest RC release, do you still see the issue?

[bdunajczyk]

Hi @keveleigh, unfortunately 2017.4.0.0 Release Candidate 2 is lacking in SpectatorView directory. When I open SpectatorViewExample.scene from new examples package there are Missing Prefabs

[keveleigh]

That's correct. The SpectatorView feature has been moved to the preview package until it's able to pass WACK. Looks like we forgot to move the examples properly though! Per the release notes:

Import HoloToolkit-Unity-PreviewFeatures-2017.4.0.0-rc2.unitypackage to include SpectatorView in your project.

[bdunajczyk]

Thank you @keveleigh, everything seems to work smoothly now! High five!

[ww362184099]

In the Unity2018.3.14,OpenCVUtils.CheckOpenCVWrapperHasLoaded() doesn't work success,and throwing an exception,but it works well in Unity2017.4.5.Could you please tell me the reason? @keveleigh