When I run the script against the font I want to modify, I get this error.. Is there something I'm missing here? <img width="262" alt="Screenshot 2022-11-28 at 9 17 53 AM" src="https://user-images.githubusercontent.com/14851850/204300124-2030f31e-2332-49c6-9b6c-9e511c2356e2.png">