Houdini unreal engine for City Sample Not executing

Development Pipeline & Plugins
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I have a Houdini 19.5 running city sample with an unreal engine. I try to execute the City Processor’s process city base but gave me following error.
how can I solve this issue ?
“Traceback (most recent call last):
File “city::Sop/processor::1.0/process_city_no_PDG”, line 1, in
File “C:/PROGRA~1/SIDEEF~1/HOUDIN~1.759/houdini/python3.7libs\hou.py”, line 47568, in getattr
return hou.HDAModule___getattr_(self, name)
AttributeError: ‘module’ object has no attribute ‘process_city’”