Problem with family instance in updater.

[AndrewButenko]

I am writing a tool that allows you to cut out some parts of a wall using a family instance and the cut geometry command.
I am also trying to create an updater for changing the wall, in which, in accordance with the change in the wall, my family instance is also rebuilt. However, sometimes in the updater, when the wall has already changed and I haven't rebuilt my family yet, I get the error "Can't cut instance(s) of Family 1 out of its host.".
Does anyone know how to solve this problem?

[moturi.magati.george]

Hi @AndrewButenko,

The issue occurs when Revit cannot regenerate the geometry to display the moved model component.

https://knowledge.autodesk.com/support/revit/troubleshooting/caas/CloudHelp/cloudhelp/2021/ENU/Revit...

[jeremy_tammik]

In the updater, you specify its change priority:

https://www.revitapidocs.com/2023/9db16841-106b-23bb-0c29-42017edcf69f.htm

That defines which other events occur before and afterwards, and where in the sequence your changes are applied.

Possibly, your changes are applied to late in the sequence.

So, the wall cat is generated before your cutting family instance has been completely updated.

Maybe setting a higher change priority will help.