Families are deleted after revit model upgrade

Hello every one,
Iam trying to update revit model from 2015 version to 2020 version through rhythm package , the code is running without any problem , but message appears as in picture , and all fittings are deleted from revit model , how to solve this problem

They are probably corrupt at some point in the process. Try upgrading one build at a time (2016 > 2017 > 2018 > etc…). Generally otherwise you will just lose some of these objects in my experience.

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Can i upgrade one build at time by dynamo and if not possible how to do it

Sure, run the script in a version of revit at a time.

The problem that i havent 2016 , 2017,2018 ,2019 versions for revit

Unfortunately its an unavoidable corruption then by the sounds of it. Maybe send your model to autodesk for assistance with their customer support.

Thank you

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