Whenever you have a problem with community- created code, you will usually get the fastest answer by looking in the author thread for that code. When you post there, the author will be automatically notified that there is a new post and other people using the same code may also be able to help.
In this case, if you look near the end of that thread, you will see that the code, which was first created in 2016, has not been updated to work with the new app or the new platform, so unfortunately it is not functional at this time. 