16/05/23 19:38:40.02 PdI6JPwU.net
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()
このエラーの原因がわからないのですが、どのような意味なのでしょう