NullReferenceException: Object reference not set to an instance of an object UnityEngine.UI.Graphic.OnRebuildRequested () (at /Users/builduser/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Graphic.cs:480) UnityEngine.UI.Text.OnRebuildRequested () (at /Users/builduser/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Text.cs:550) UnityEngine.UI.GraphicRebuildTracker.OnRebuildRequested () (at /Users/builduser/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/GraphicRebuildTracker.cs:33) UnityEngine.CanvasRenderer.RequestRefresh () UnityEditor.HostView:OnGUI()