Ah, I see. So the actual command I was trying to execute was

python controller.py

I checked controller.py, and got an error message:

Traceback (most recent call last):
File...

Hello!

I'm trying to execute a simple script in the command line, and for some reason, it's not working. Shouldn't it be as simple as this?

python myscript.py

And yet when I try that, I get...