Create family by Family by geometry

Hi. I am very new to the dynamo. I am trying to create a window family by dynamo geometry.
It is work when I used import instance by geometry into the Revit.
However, it can’t create as a family.

There are two warning appeared one is " A managed exception was thrown by Revit or by one of its external applications " and " Warning: FamilyType.ByGeometry operation failed.
Input template file is invalid for the document type to be created! "


make sure your family template is a .rft

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