调用一个类在一个窗口中构建一个QTreeWidget:参数1有一个意想不到的类型“Ui_MainWindow”

I'm using code that I got from ekhumoro to dynamically create a tree from an xml file for a GUI that I've created, however when attempting to call the class inside the _ui.py file generated from pyuic4 I'm getting the Ui_MainWindow class returned instead of the expected argument. to dyna