I got the same error on login today. The window in question is the mini-map. A quick fix was posted in the ProfitUI forums. According to Bunji, in a post in the official forums: "The UI file eq2ui_mainhud_map2.xml was updated. If you're using a custom UI file you may need to change version="1.2" to version="2.0" at the end of the first line of that xml."
I went in and made the version change mentioned, and got the mini-map working again.
-= Therendil =-
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