ProBuilder problem.

When I go to full screen in ProBuilder 2.x it gave me that error, can anyone fix this problem? NullReferenceException: Object reference not set to an instance of an object ProBuilder2.Common.pb_ElementGraphics.OnDisable () (at :0) UnityEngine.Object:set_hideFlags(HideFlags) ProBuilder2.Common.pb_ElementGraphics:Awake() UnityEngine.GameObject:AddComponent() ProBuilder2.Common.pb_MonoBehaviourSingleton`1:get_instance() ProBuilder2.EditorCommon.pb_Editor:get_graphics() ProBuilder2.EditorCommon.pb_Editor:OnEnable() UnityEditorInternal.InternalEditorUtility:LoadSerializedFileAndForget(String) UnityEditor.EditorApplication:Internal_CallGlobalEventHandler()