So here's the thing, I'm following the exact example shown here:
https://developers.trello.com/v1.0/reference#lists-1
I'm trying to create a new list, yet all that I'm getting is "Invalid Board id"
I'm using the same API that the website is, and it keeps giving me that error.
I have checked my id is correct according to this picture:

Can someone help? I'm loosing patience.
Cheers!
DYelamos