Can someone put me out of my pain and tell me why I get an error when I remove
 void mousePressed()........see at bottom of code

I get this error.......

java.lang.nullPointerException

I am not interested in loosing the logic to produce the intention of the program but to understanding why the error because removing the void mousepressed() should not cause a problem but it does.
 I am coming from a basic programing background.
Thanks for your help
Franklin
Trinidad, West Indies


import processing.video.*;
Capture myCapture;

void setup()
{
  size(200, 200);

  // The name of the capture device is dependent those
  // plugged into the computer. To get a list of the
  // choices, uncomment the following line
   println(Capture.list());
  // And to specify the camera, replace "Camera Name"
  // in the next line with one from Capture.list()
  // myCapture = new Capture(this, width, height, "Camera Name", 30);
 
  // This code will try to use the last device used
  // by a QuickTime program
  myCapture = new Capture(this, width, height, 30);
}

void captureEvent(Capture myCapture) {
  myCapture.read();
}

void draw() {
  image(myCapture, 0, 0);
}

void mousePressed() {
  myCapture.stop();
}