Control a device parameter by device name, not working in CSS3?

I don’t know if this is an actual bug, but I followed to the letter the video (https://www.youtube.com/watch?v=3v6zPfnkP3M) to make sure that I was doing this correctly. I had done this with the previous CSS version 2.8 without issues but I seem to get stuck here.

“SyntaxError
:
invalid syntax. Perhaps you forgot a comma?
Traceback (most recent call last):
File “”, line 1, in
File “C:\ProgramData\Ableton\Live 12 Suite\Resources\MIDI Remote Scripts\css_test_init_.py”, line 2, in
from .css_test import css_test. 

File “C:\ProgramData\Ableton\Live 12 Suite\Resources\MIDI Remote Scripts\css_test\css_test.py”, line 374″

I used Google AI studio to see if I could understand the problem and got this reply (not sure if it is helpful):

“The Mistake: The function responsible for building this “address” (c_mod) makes a mistake. Instead of creating the correct path…

Correct path: selected_track + .devices + [2] + .parameters[1]

…it incorrectly puts it together like this: Incorrect path: selected_track + 2 + .parameters[1] 

It completely omits the crucial .devices part of the address. When Ableton receives this broken address, it doesn’t understand it.”

the file is a very simple one, I have attached it