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ConcurrentModificationException

mcdpdrmcdpdr
edited October 2016 in Library Questions 
Hi I only started months ago using Processing. I used the library ControlP5 to create my GUI. I modified the example provided by the library called ControlP5Frames in /controllers. I want to display another window when I pressed a button in the main window. My problem is, error _ConcurrentModificationException_ occurs when I close the second window. 


Below is my code:

`import java.awt.*;
import java.awt.event.*;
import controlP5.*;

private ControlP5 cp5;

ControlFrame cfConfig;

String actualColors[] = {"Red","Green","Blue","Yellow"};
  String arrangement[] = {"Corners","All Top","Right Side","Left Side"};
  int selectedColors[] = new int[4];
  int selectedArrangement = 0;
  int removeMe;

void initMainGUI(){

  cp5.addButton("config")
     .setLabel("Configuration")
     .setPosition(100,400)
     .setSize(200,19)
     ;

  cp5.addButton("homePosition")
     .setLabel("Home Position")
     .setPosition(400,400)
     .setSize(200,19)
     ;

  cp5.addButton("systemStart")
     .setLabel("Start Sorting")
     .setPosition(700,400)
     .setSize(200,19)
     ;

}

void config(){
 cfConfig = addControlFrame( "Configuration", 720, 600, 20, 50, color( 100 ), 0);
}

void setup(){
  size(1000, 500);
  cp5 = new ControlP5(this);

  initMainGUI();
}

void draw(){

}

ControlFrame addControlFrame(String theName, int theWidth, int theHeight, int theX, int theY, int theColor ,int type) {
  final Frame f = new Frame( theName );
  final ControlFrame p = new ControlFrame( this, theWidth, theHeight, theColor, type);

  f.add( p );
  p.init();
  f.setTitle(theName);
  f.setSize( p.w, p.h );
  f.setLocation( theX, theY );
  f.addWindowListener( new WindowAdapter() {
      public void windowClosing(WindowEvent we) {
      p.dispose();
      f.dispose();
    }
  } 
  );
  f.setResizable( false );
  f.setVisible( true );
  // sleep a little bit to allow p to call setup.
  // otherwise a nullpointerexception might be caused.
  try {
    Thread.sleep( 100 );
  } 
  catch(Exception e) {
  }
  return p;
}

class ControlFrame extends PApplet {

  int w, h;
  int bg;
  int windowType;
  PApplet parent;
  ControlP5 cp5;

  public ControlFrame(PApplet _parent, int _w, int _h, int theColor,int type) {
    super();   
    parent = _parent;
    w=_w;
    h=_h;
    bg = theColor;
    windowType=type;
  }


  public void setup() {
    size(w, h);
    cp5 = new ControlP5(this);
    if(windowType==0){
      initConfig();   
    }
  }

  public void initConfig(){

  cp5.addScrollableList("prioOne")
     .setLabel(" ")
     .setPosition(100, 60)
     .setSize(100, 100)
     .setBarHeight(20)
     .setItemHeight(20)
     .addItems(actualColors)
     .setOpen(false)
     ;

  cp5.addTextlabel("labelOnce")
    .setText("Priority One")
    .setFont(createFont("Calibri",12))
    .setPosition(20,60)
    .setColorValue(#000000)
    ; 

   cp5.addTextlabel("labelTwo")
    .setText("Priority Two")
    .setFont(createFont("Calibri",12))
    .setPosition(20,90)
    .setColorValue(#000000)
    ; 

   cp5.addTextlabel("labelThree")
    .setText("Priority Three")
    .setFont(createFont("Calibri",12))
    .setPosition(20,120)
    .setColorValue(#000000)
    ; 

   cp5.addTextlabel("labelFour")
    .setText("Priority Four")
    .setFont(createFont("Calibri",12))
    .setPosition(20,150)
    .setColorValue(#000000)
    ; 

   cp5.addTextlabel("labelFive")
    .setText("Arrangement")
    .setFont(createFont("Calibri",12))
    .setPosition(20,180)
    .setColorValue(#000000)
    ; 

  cp5.addTextlabel("labePOH")
  .setText("Priority One H")
  .setFont(createFont("Calibri",12))
  .setPosition(20,250)
  .setColorValue(#000000)
  ;  

  cp5.addTextlabel("labePTH")
  .setText("Priority Two H")
  .setFont(createFont("Calibri",12))
  .setPosition(20,310)
  .setColorValue(#000000)
  ; 

  cp5.addTextlabel("labePThH")
  .setText("Priority Three H")
  .setFont(createFont("Calibri",12))
  .setPosition(20,370)
  .setColorValue(#000000)
  ; 

  cp5.addTextlabel("labePFH")
  .setText("Priority Four H")
  .setFont(createFont("Calibri",12))
  .setPosition(20,430)
  .setColorValue(#000000)
  ; 

  cp5.addTextlabel("labeSmtH")
  .setText("Gripper H")
  .setFont(createFont("Calibri",12))
  .setPosition(20,490)
  .setColorValue(#000000)
  ; 

  }

  boolean updateGui=false;
  int nextState=0;

  void updatingGui(){
  if(nextState==1){
    cp5.addScrollableList("prioTwo")
   .setLabel(" ")
   .setPosition(100, 90)
   .setSize(100, 100)
   .setBarHeight(20)
   .setItemHeight(20)
   .addItems(actualColors)
   .setOpen(false)
   .bringToFront();
   ;
  }else if(nextState==2){
    cp5.addScrollableList("prioThree")
   .setLabel(" ")
   .setPosition(100, 120)
   .setSize(100, 100)
   .setBarHeight(20)
   .setItemHeight(20)
   .addItems(actualColors)
   .setOpen(false)
   .bringToFront();
   ;
  }else if(nextState==3){
    cp5.addScrollableList("prioFour")
   .setLabel(" ")
   .setPosition(100, 150)
   .setSize(100, 100)
   .setBarHeight(20)
   .setItemHeight(20)
   .addItems(actualColors)
   .setOpen(false)
   .bringToFront();
   ;
  }else if(nextState==4){
    cp5.addScrollableList("prioFive")
   .setLabel(" ")
   .setPosition(100, 180)
   .setSize(100, 100)
   .setBarHeight(20)
   .setItemHeight(20)
   .addItems(arrangement)
   .setOpen(false)
   .bringToFront();
   ;
  }else if(nextState==5){
   cp5.addSlider("oneH")
     .setPosition(20,270)
     .setSize(200,20)
     .setRange(0,255)
     .setValue(128)
     .getCaptionLabel().align(ControlP5.TOP, ControlP5.BOTTOM_OUTSIDE).setPaddingX(0);
     ;

   cp5.addSlider("twoH")
   .setPosition(20,330)
   .setSize(200,20)
   .setRange(0,255)
   .setValue(128)
   .getCaptionLabel().align(ControlP5.TOP, ControlP5.BOTTOM_OUTSIDE).setPaddingX(0);
   ;

   cp5.addSlider("threeH")
     .setPosition(20,390)
     .setSize(200,20)
     .setRange(0,255)
     .setValue(128)
     .getCaptionLabel().align(ControlP5.TOP, ControlP5.BOTTOM_OUTSIDE).setPaddingX(0);
     ;

   cp5.addSlider("fourH")
     .setPosition(20,450)
     .setSize(200,20)
     .setRange(0,255)
     .setValue(128)
     .getCaptionLabel().align(ControlP5.TOP, ControlP5.BOTTOM_OUTSIDE).setPaddingX(0);
     ;

   cp5.addSlider("fiveH")
     .setPosition(20,510)
     .setSize(200,20)
     .setRange(0,255)
     .setValue(128)
     .getCaptionLabel().align(ControlP5.TOP, ControlP5.BOTTOM_OUTSIDE).setPaddingX(0);
     ;

    }
  updateGui=false;
  }

  boolean prioOne=true;

  void prioOne(int n){
    println("Priority One: " + actualColors[n]);
    selectedColors[0]=n;
    if(prioOne){
      updateGui=true;
      nextState=1;
      prioOne=false;
    }
  }

  boolean prioTwo=true;

  void prioTwo(int n){
    println("Priority Two: " + actualColors[n]);
    selectedColors[1]=n;
    removeMe=n;
    if(prioTwo){
      updateGui=true;
      nextState=2;
      prioTwo=false;
    }
  }

  boolean prioThree=true;

  void prioThree(int n){
    println("Priority Three: " + actualColors[n]);
    selectedColors[2]=n;
    removeMe=n;
    if(prioThree){
      updateGui=true;
      nextState=3;
      prioThree=false;
    }
  }

  boolean prioFour=true;

  void prioFour(int n){
    println("Priority Four: " + actualColors[n]);
    selectedColors[3]=n;
    removeMe=n;
    if(prioFour){
      updateGui=true;
      nextState=4;
      prioFour=false;
    }
  }

  boolean prioFive=true;

  void prioFive(int n){
    println("Arrangement: "+arrangement[n]);
    selectedArrangement=n;
    removeMe=n;
    if(prioFive){
      updateGui=true;
      nextState=5;
      prioFive=false;
    }

  }

  void oneH(int theColor) {
    println("Priority One H: "+theColor);
  }

  void twoH(int theColor) {
    println("Priority Two H: "+theColor);
  }

  void threeH(int theColor) {
    println("Priority Three H: "+theColor);
  }

  void fourH(int theColor) {
    println("Priority Four H: "+theColor);
  }

  void fiveH(int theColor) {
    println("Gripper H: "+theColor);
  }

  public void draw(){
    background(bg);
    if(updateGui){
     updatingGui(); 
    }
  }


}


`
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