How to set up 2to3 in Pycharm under Windows

Hi, I'm new to Python and Pycharm, I have quite a few scripts for a program called Autodesk Maya and they are all created in Python 2, now I'm trying to convert them to Python 3 and I saw in the net a few guides on how to set up 2to3 as an external tool for Pycharm.

I set up the external tool like this

And I get this error

Not sure what I'm doing wrong, the 2to3.py it's installed. Hope somebody can give me some inputs.

Kind regards.