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can't use webcam (error)

hello,

 

whenever i try to use the play button on vuforia, it gives me this message and won't load any further. any ideas?

 

Vuforia is configured for VR, checking if the camera and default trackers can be stopped... UnityEngine.Debug:Log(Object) Vuforia.VuforiaARController:DisableCameraIfNotNeeded() Vuforia.VuforiaARController:UpdateStatePrivate(Boolean, Boolean) Vuforia.VuforiaARController:UpdateState(Boolean, Boolean) Vuforia.DigitalEyewearARController:Update() System.Delegate:DynamicInvoke(Object[]) Vuforia.DelegateHelper:InvokeDelegate(Delegate, Object[]) Vuforia.DelegateHelper:InvokeWithExceptionHandling(Action) Vuforia.VuforiaBehaviour:Update()