CitySample in Houdini Can't export

I followed the Unreal Engine’s guide and tried to generate a city.
In step 11-3-1 of the guide below I ran into an error.
When I check the use PDG checkbox and press the process city base button below it, Houdini gives me this error.
If I do not check the checkbox, it gives me another error.

The content is as follows

Error running callback:.
Traceback (most recent call last):.
File “city::Sop/processor::1.0/process_base”, line 1, in <module
File “E:\Houdini/Soft/Houdini20.5.332/houdini/python3.11libs\hou.py”, line 56422, in getattr
return hou.HDAModule___getattr_(self, name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: ‘module’ object has no attribute ‘do_base’

Does anyone know how to resolve this error?
I am new to this tool and don’t know what to do.

I followed this guide

(Machine translation is used)