Dynamo graph Sheet

Hi all,

I’m new to Dynamo. Currently i have some scripts i try to understand and work with them. I dont understand the error in the script shown in the atttached screenshot.

I have the needed Bimorph node downloaded. When i run the script the slected sheet in Revit wont get duplicated and I get a errormessage. (yellow in the screenshot)

Any one know what the problem is? Thanks!

i can see double outputs (Sheet) on the node, soi think you need to update Revit.
So if you are on R2018 update to the latest version of 2018

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By making the graph again from scratch the problem was solved!