List.create node return NULL

Hi All,

List.creat node return NULL . Any idea ?

Looks like you need to close and rerun your graph.

i did that too many times

i will try to reinstall Dynamo

Which Revit Version you’re using? Make sure you have the latest Revit build version.


list.creat somtimes read the data and sometimes not


i think the problem came from Revit becuse i tried it with different data it works but when i came back to the same data it wont

Revit bug, i tried to duplicate the floor plan and he gave me error .

thank you every body for help, we will always learning

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  • 20201109_1530(x64)
  • 2021.1.2