I'm little confused. Please clarify where do you want to run the Addin (in the Family editor or in the Project file). In case you want to insert the family to the project then add the connector there then this will be another story. If you want to add the connectors in Family editor then the provided code is working perfectly. One last thing this code is written for Revit 2016 API so if you are targeting another version this may require some modification to the provided code.
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