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MpcProperty python exception while getting extrusion info:
Python error
'NoneType' object has no attribute 'property' (Type: <class 'AttributeError'>)
TraceBack:
File "C:/Program Files/STKO\external_solvers\opensees\physical_properties\special_purpose\BeamSectionProperty.py", line 1146, in makeExtrusionBeamDataCompoundInfo
info.add(info_item.property, 1.0, True, False, info_item.yOffset, info_item.zOffset)

You did not assign a section in the field secTag in the BeamSectionProperty.

I would suggest you check out this webinar for more on Physical Properties
https://asdeasoft.net/?get-started-webinars#w5

Let us know if you need anything else.
Francesca