Assuming that you have some case type with class name RMO-RanieriT-Work-SomethingSomething.
Case type SomethingSomething has a flow with an Assignment.
At that Assignment you have a "CreatePerson" flow action that references a section named "CreatePerson" .
Also assuming that the Applies-To class of this "CreatePerson" flow action is RMO-RanieriT-Work-SomethingSomething.
But the Applies-To class of your "CreatePerson" Section is RMO-RanieriT-Data-Person.
You cannot draw a Section unless it has a page.
What can do is have the pre-Activity of the RMO-RanieriT-Work-SomethingSomething-implemented "CreatePerson" flow action "Page-New"a page, say one named "Person", of class RMO-RanieriT-Data-Person then configure the "CreatePerson" flow action to source the "Person" page when displaying the "CreatePerson" flow action,
You can also define a "CreatePerson" Section in RMO-RanieriT-Work-SomethingSomething that includes the RMO-RanieriT-Data-Person "CreatePerson" Section.
When you do the "Section include" you need to specify the underlying page ("Person") and applies-to class ("RMO-RanieriT-Data-Person") plus the name of the Section to draw ("CreatePerson").
A Page can also be an embedded Page Property such as ".Person".
Since this is an embedded page, you can construct it within your pyDefault transform simply by setting a value such as: .Person.pyLabel = "Person".