I am having an issue that I hope is simple to solve.
I have 2 sheets that have multiple revision clouds with comments that act as “version” numbers that I want to populate the title block with.
Sheet 1 Revision Cloud Comments:
Sheet 2 Revision Cloud Comments:
I want to group these “comments” by sheet. So that the list structure looks like this:
|  List
|  List
I’d like to then choose the last comment in each sheet to populate the title block. However, I am getting an error “Warning: List.GroupByKey operation failed.
Number of items does not match the number of keys.”.
Any ideas on how I can achieve a list that is grouped by sheets?
Sample Revit Project and Dynamo file can be found at this link:
Thanks in advance.