NullReferenceException: Object reference not set to an instance of an objecttk2dTextMesh.NumTotalCharacters () (at Assets/TK2DROOT/tk2d/Code/Fonts/tk2dTextMesh.cs:462)tk2dTextMeshEditor.OnInspectorGUI () (at Assets/TK2DROOT/tk2d/Editor/Fonts/tk2dTextMeshEditor.cs:330)UnityEditor.InspectorWindow.DrawEditors (Boolean isRepaintEvent, UnityEditor.Editor[] editors, Boolean eyeDropperDirty)UnityEditor.DockArea:OnGUI()