Control Change Potentiometer Example doesn't compile for Teensy 4.1

[jaaaamIron]

Hi. The included library example "Control Change Potentiometer" doesn't compile for Teensy 4.1. I haven't made any changes to the included code in the latest version of the library. Here is the error:
Compilation error: 'USBMIDI_Interface' does not name a type

[tttapa]

You need to select the correct USB type to be able to use MIDI over USB (when encountering an error, it is a good idea to scroll up to the very first message: you should have received a warning saying #warning "Teensy: USB MIDI not enabled. Enable it from the Tools > USB Type menu.").
See also Control Surface: MIDI over USB.