Assets/Stitchscape/Editor/Stitchscape/Stitch.js(74,61): BCW0012: WARNING: ‘UnityEditor.EditorGUILayout.ObjectField(UnityEngine.Object, System.Type, *UnityEngine.GUILayoutOption[ ])’ is obsolete. Check the docs for the usage of the new parameter ‘allowSceneObjects’.
Because the method is deprecated and shouldn’t be used anymore! It will probably get removed in future, so you should use the new parameters if you want your game/project be compatible with future versions.
There is the “allowSceneObjects” (bool/boolean) parameter missing. You should do what the error message tells you: Check the documentation!
That’s the 3 different ways to use this Method correctly: