Issues Loading Extention in 4.15 (Revit 2022 and 2024)

Hi guys,

I got around to checking out the new release of pyRevit from the other week and I keep getting this error message when I try to load my extension I get the error message below. Does anyone know how I can troubleshoot or can provide any insight into what I might be doing wrong.


I think it may be something to do with my extension - just tested on a colleagues computer with an older version of pyrevit and it threw up the same error.

Will report back.

Can you show your folders for your extension? Probably a mistake in the organisation or the naming.

Hey Jean-Marc,

Yep see below.

This is what’s in the hooks folder


This is in the Crop Stack


I tend to proceed as follow:

  1. remove all but one panel
  2. reload
  3. if it works, add some portion of the previously removed folder
    and so on…

hard to tell precisely but to me it looks like an error in one of the bundle.yaml file

Found it - you were right Jean-Marc. is was the yaml file in .tab. The culprit was " - RDS[title: Room Data Sheets]".

Extension is back up and running now. Thanks for your help.


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