UIPopupException: easyar.SurfaceTracker not available
easyar.SurfaceTrackerFrameFilter.Awake () (at Assets/EasyAR/Scripts/SurfaceTrackerFrameFilter.cs:37)
Fail to Assemble: Object reference not set to an instance of an object
UnityEngine.Debug:LogError(Object)
easyar.ARAssembly:Assemble(ARSession) (at Assets/EasyAR/Scripts/ARAssembly.cs:109)
easyar.ARSession:Start() (at Assets/EasyAR/Scripts/ARSession.cs:61)