I have recently been trying to solve a PDF renaming task with Dynamo. Currently Revit is automatically generating a file name for hundreds of PDF’s we are printing. I have got my script to the point where I am passing the correct names to the archi-lab rename files node and it is acting a bit strange. Every time I run the script it renames only one of the pdf’s but does not format it with the correct name or the .pdf extension. It renames it with a Capital letter G. Can anyone spot my mistake? I am receiving a trace!back error stating the file already exists and that something is up with line 27 in the pythons script for the Rename Files node.