[tStano]

It appears that you have not initialized your button. You initialized the joystick but you need to initialize the button as well. Thats my best guess.

Also, If this is a pneumatic solenoid and you're expecting it to go in and out; it wont; you'll need a second solenoid object for the retract. If its an electrical or single action solenoid, ignore this bit, I have no experience in those areas.