This is marked as a Unity bug with using GUILayout.Window within an EditorWindow. I have already reported this issue to Unity both through their bug report as well as in the forums along with a simple reproduction (LINK) . From my experience with this error, it is harmless and does not affect anything, but of course it would be nice if Unity fixes this.
Please let me know if this affects your use of the software in any way.
Thank you.
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