The component "Video Player" is not working together with Vuforia for Hololens

my system is Unity 2017.2f3, win 10.

error information is like this:

Trackable Astronaut found 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:OnTrackerUpdate(Status) Vuforia.DataSetTrackableBehaviour:OnTrackerUpdate(Status) Vuforia.HoloLensExtendedTrackingManager:ApplyTrackingState(TrackableBehaviour, Status, Transform) Vuforia.StateManager:UpdateTrackablePoses(Transform, TrackableResultData[], VuMarkTargetResultData[], TrackableIdPair, Int32, Boolean) Vuforia.StateManager:UpdateTrackablePoses(Transform, TrackableResultData[], VuMarkTargetResultData[], TrackableIdPair, Int32) Vuforia.VuforiaManager:UpdateTrackers(FrameState) Vuforia.VuforiaManager:Update(ScreenOrientation, Boolean&) Vuforia.VuforiaARController:UpdateStatePrivate(Boolean, Boolean) Vuforia.VuforiaARController:UpdateState(Boolean, Boolean) Vuforia.DigitalEyewearARController:Update() System.Reflection.MonoMethod:InternalInvoke(Object, Object[], Exception&) System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo) System.Reflection.MethodBase:Invoke(Object, Object[]) System.Delegate:DynamicInvokeImpl(Object[]) System.MulticastDelegate:DynamicInvokeImpl(Object[]) System.Delegate:DynamicInvoke(Object[]) Vuforia.DelegateHelper:InvokeDelegate(Delegate, Object[]) Vuforia.DelegateHelper:InvokeWithExceptionHandling(Action) Vuforia.VuforiaBehaviour:Update() (Filename: C:\buildslave\unity\build\artifacts/generated/Metro_IL2CPP/runtime/DebugBindings.gen.cpp Line: 51)

Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998. Exception thrown at 0x76EF2552 in Vuforia HoloLens Sample.exe: Microsoft C++ exception: _com_error at memory location 0x0BF3A998.