[Pharo-project] Getting input from a pen tablet?

Hi everyone! I hope this is a stupid thing that is just driving me crazy because of my * newbieness* on the subject, but if I evaluate this: Sensor tabletPoint I get a PrimitiveFailed error. The plugin needed for getting input from pen tablets is JoystickTabletPlugin and is an external plugin of Cog. What do I need to do to make that message work? Thanks! Carla.