How to debug "ArrayIndexOutOfBoundsException: 0" in Processing -

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i'm trying make kim asendorf's pixel sorting code work input webcam in processing.

i error: "arrayindexoutofboundsexception: 0". ideas of how can fix this?

//black int getfirstnotblacky(int _x, int _y) { int x = _x; int y = _y; color c; if (y < height) { while ( (c = cam.pixels[x + y * cam.width]) < blackvalue) {   y++;   if (y >= height) return -1; }     import processing.video.*;  capture cam;   string[] cameras = capture.list();  int mode = 0;  //mode: //0 -> black //1 -> bright //2 -> white //b(16777216)   int loops = 1;  int blackvalue = -10000000; int brigthnessvalue = 60; int whitevalue = -6000000;  int row = 0; int column =  boolean saved = false;  void setup() {   size(640, 480);    import processing.video.*;    string[] cameras = capture.list();    import processing.video.*;    if (cameras.length == 0) {     println("there no cameras available capture.");     exit();   } else {     println("available cameras:");     (int = 0; < cameras.length; i++) {       println(cameras[i]);     }      // camera can initialized directly using      // element array returned list():     cam = new capture(this, cameras[0]);     cam.start();   }  }

i've added code i'm using initialize webcam.


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