Using ControlP5 library, I am trying to control the activation of a button using the keyboard, so when a key is pressed, I want the button to be active.

So I created the object 

1. ControlP5 myControl;  
2. // (...)
3. myControl = new ControlP5(this); 
4. myControl.addButton("special button", 1, 100, 200, 100, 200);

However, I receive the message

The function setOn() does not exist

So, what did I miss?

Thanks in advance.