Probably better to write this on the Dynamo forum https://forum.dynamobim.com/. There you will often find the writers of the different packages.
Then also include more information about the issue.
-Which Revit version?
-Which version of the archi-lab package did you use?
-When does this error occur, when you place the node, when you run the script?
-What does the script look like?
-Have you tried with a clean script (maybe some issue in the current script)?
-Have you tried uninstalling and reinstalling the archi-lab package?
-Have you tried a different version of the archi-lab package (newer or older)?
-Have you looked for a similar node from another package?
Louis

Please mention Revit version, especially when uploading Revit files.