Unable to create new geometry in GDML workbench

[Gadajilehu]

Thank you for your response to my previous question，and I have a new problem.I feel like I have successfully installed the GDML workbench. I can import gmsh and lXML from the freecad command line, but when I create any geometry in the workbench, this error will be reported.

11:58:20  Running the Python command 'EllipsoidCommand' failed:
Traceback (most recent call last):
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\GDMLCommands.py", line 1201, in Activated
    GDMLEllipsoid(obj, 10, 20, 30, 0, 0, "mm", material)
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\GDMLObjects.py", line 1050, in __init__
    setMaterial(obj, material)
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\GDMLObjects.py", line 160, in setMaterial
    rebuildMaterialsList()
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\GDMLObjects.py", line 108, in rebuildMaterialsList
    addMaterialsFromGroup(doc, MaterialsList, "Materials")
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\GDMLObjects.py", line 87, in addMaterialsFromGroup
    buildDefaultGDMLDoc(doc)
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\GDMLObjects.py", line 94, in buildDefaultGDMLDoc
    processGDML(
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\importGDML.py", line 3365, in processGDML
    preProcessLoops.preprocessLoops(root)
  File "C:\Users\Administrator\AppData\Roaming\FreeCAD\Mod\GDML\.\freecad\gdml\preProcessLoops.py", line 97, in preprocessLoops
    for loop in root.getroot().iterdescendants(tag="loop"):

'xml.etree.ElementTree.Element' object has no attribute 'getroot'
'''