Revit API error

i am trying to place a family by points using Revit API.I am getting an error which says …
Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed.
Traceback (most recent call last):
File “”, line 25, in
Exception: The symbol is not active.
Parameter name: symbol

can anybody help to resolve

Family Instances by points (Python and Revit API).dyn (7.5 KB)

you need implement this method before creation of instance

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