ARcore urho sample does not work only for android and crashes

Hello, i tried to download the sample github.com/xamarin/urho-samples/tree/master/ARCore and getting it to work on my android device (8.0) using Samsung S8, but with no success, as soon as it asks for camera permission the camera feed does not appear and when i click in any giving button it crashes. Can you please help ?

the link for the project : github.com/xamarin/urho-samples/tree/master/ARCore

[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.Exception: Failed to compile vertex shader ARCore():
[mono-rt] 0:593: P0001: Extension directive must occur before any non-preprocessor tokens
[mono-rt] 0:597: L0001: Typename expected, found 'samplerExternalOES'. You can omit this exception by subscribing to >Urho.Application.UnhandledException event and set Handled property to True.
[mono-rt] ApplicationOptions: args -w -p "CoreData;MutantData" -hd -landscape -portrait
[mono-rt] at Urho.Application.ThrowUnhandledException (System.Exception exc) [0x000de] in <965326e0f5c24b1cb5201899a33f6f26>:0
[mono-rt] at Urho.Runtime.OnNativeCallback (Urho.CallbackType type, System.IntPtr target, System.IntPtr param1, System.Int32 param2, System.String param3) [0x001f3] in <965326e0f5c24b1cb5201899a33f6f26>:0

[mono-rt] at (wrapper managed-to-native) Urho.Application.Application_Run(intptr)
[mono-rt] at Urho.Application.Run () [0x00000] in <965326e0f5c24b1cb5201899a33f6f26>:0
[mono-rt] at Urho.Droid.UrhoSurface+<>c__DisplayClass15_0.b__0 (System.IntPtr _) [0x00017] in <965326e0f5c24b1cb5201899a33f6f26>:0
[native] filter_update_base.cc:87 Temporary visual feature update failed when computing its residual and Jacobian.
[native] vio_fault_detector.cc:489 VIO did not use vision constraints.
[native] filter_update_base.cc:87 Mapped visual feature update failed when computing its residual and Jacobian.
[native] filter_update_base.cc:87 Temporary visual feature update failed when computing its residual and Jacobian.
[native] filter_update_base.cc:87 Temporary visual feature update failed when computing its residual and Jacobian.
[native] localization_manager.cc:519 Map tracking detected failure condition that despite good tracking metrics gravity check failed. Reporting corrupted state.
[[email protected][MainActivity]] ViewPostIme pointer 0
[OpenGLRenderer] Failed to set damage region on surface 0x7b8021db90, error=EGL_NOT_INITIALIZED
[libc] Fatal signal 6 (SIGABRT), code -6 in tid 8340 (RenderThread)

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