Hi,
I am trying to gain some skills in using Dynamo and I am havin’ some trouble in getting things works.
Since a while I’m working at the rebars distribution and having some tutorials from youtube (very helpful:DiRoots Dynamo Package - Structural Rebar - Video 1 - YouTube ). The issues is that when I am trying to implement the examples I’m facing some errors in my Dynamo. I’m uploading also some images from my PC to show better the issue.
I searched a while trough the forum and I think that is a incompatibility between the Revit core and Dynamo Core, but I can not figure it out?
If someone know how should I solve this please post it! 
Diroots Package is expired, this seems to be the reason.