Plz, tell me How can i solve the -- start:applet not initilized error..

Question

Here is my code
  * Sigmoid Function Generator
  * @author
  * @version
*<applet code="Sigmoid" width=500 height=500></applet>
import java.awt.*;
public class Sigmoid extends java.applet.Applet implements Runnable
    private static final long serialVersionUID = 5622349801036468572L;
   boolean finished = false;          //indicates when the curve has been completed
   double k = .025;                   //non-linearity constant
   double y = k / 4;                  //output value
   double x = 0;                      //input value
   double dx = k / 10;                //plotting (or look-up table) increment
   int s = 200;                       //pixels per unit real (scaling factor)
   int H = 0, V = s - 1;              //window co-ordinate of graphical origin
   int X, Y;                          //dimensions (in pixels) of the applet window
   Image I = null;                    //reference for an off-screen image I
   Graphics i = null;                 //graphics context for the off-screen image
   long TF = 50;                      //total Time Frame for plotting update cycle
   long T;                            //time at which the next new cycle is due to begin
   Thread plotting;                   //declare a thread reference variable
   Font font;                         //and a font reference for annotations
   Color tr;                          //trace colour
   boolean TypeFlag = false;          //set for unipolar presentation
   public void init()
      {                                         //INITIALISE THE APPLET
      int Xy, Yx;                                 //co-ords of axis labels
      tr = new Color( 0, 128, 64);                //create special dark green for trace
      font = new Font("Dialog", Font.PLAIN, 12);  //choose the lettering font for this applet
      Dimension d = getSize();                    // instead of size() use this method, get size of window as given in HTML applet tag
      X = d.width; Y = d.height;                  //establish window width and height
      I = createImage(X, Y);                      //create the off-screen image I
      i = I.getGraphics();                        //graphics context reference for off-screen image
      if(getParameter("type").equals("bipolar"))
          {                                       //if applet parameter 'type' = 'bipolar'
         TypeFlag = true;                         //set the TypeFlag true;
         k = .011;                                //non-linearity constant
         y = 0;                                   //output value
         x = 0;                                   //input value
         dx = .0025;                              //plotting (or look-up table) increment
         s = 100;                                 //pixels per unit real (scaling factor)
         H = 100; V = 100;                        //window co-ordinate of graphical origin
         Xy = V + 10; Yx = H - 10;                //co-ords of axis letters
      else
         {                                         //if doing a unipolar graph
         Xy = V - 5; Yx = H + 5;                  //co-ords of axis letters
      i.setColor(Color.lightGray);                //set background colour for the off-screen image
      i.fillRect(0, 0, X, Y);                     //paint background of off-screen image
      i.setFont(font);                            //set up the annotation font
      i.setColor(Color.gray);                     //set colour for drawing the graph axes
      i.drawLine(0, V, X, V);                     //draw x axis
      i.drawLine(H, 0, H, Y);                     //draw y axis
      i.setColor(Color.black);                    //set colour for lettering
      i.drawString("X", X - 10, Xy);        
      i.drawString("Y", Yx, 10);                  //print the X and Y axis letters
      i.setColor(tr);                             //set colour to paint the trace on image
      T = System.currentTimeMillis() + TF;        //set end time for current update time frame
   public void paint(Graphics g)
   {         //set up the graphics
      g.drawImage(I, 0, 0, null);          //(re)draw from the off-screen image I
   public void update(Graphics g)
        {                                            //PLOT THE SIGMOID GRAPH
      if(x > 1 || y > 1)                   //if plot has reached edge of graph
         finished = true;                  //set the 'finished' flag
      else {                               //if not yet finished plotting graph
         int h = (int)(s * x);             //convert horizontal plot to pixels
         int v = (int)(s * y);             //convert vertical plot to pixels
         g.setColor(tr);                   //set colour to paint the trace on screen
         int a = h, b, c = V - v, d;       //simplify pixel co-ordinates
         if(TypeFlag)
            a = H - h; b = H + h;          //simplify pixel co-ordinates
            c = V + v; d = V - v;
            g.drawLine(b, d, b, d);        //do next plot in lower left quadrant
            i.drawLine(b, d, b, d);        //do next plot in lower left quadrant
            y += k * (1 - y);              //advance the output difference equation
         } else
            y += k * y * (1 - y);          //advance the output difference equation
         x += dx;                          //advance the input value
         g.drawLine(a, c, a, c);           //do next plot in upper right quadrant
         i.drawLine(a, c, a, c);           //do next plot in upper right quadrant
   public void run() {                            //run the plotting thread
      while(true) {                               //permanent loop broken by external event
         if(!finished) repaint();                 //if not yet finished, do next plot
         long s = T - System.currentTimeMillis(); //get time remaining in this cycle's time frame
         if (s < 5) s = 5;                        //in case host PC is too slow for ideal trace speed
         try {
             Thread.currentThread().sleep(s);    //sleep for remaining time
         catch (InterruptedException e)
             System.out.println(e);
                                                    //allow browser events to break the thread
             }                                        //happens if you return to applet's HTML page
         T = System.currentTimeMillis() + TF;     //set finish time of next time frame
   public void start() {                          //Start program thread by
      plotting = new Thread(this);                //creating the thread object
      plotting.start();                           //and starting it running
   }                                              //[returns a call to run()]
// public void stop() {plotting.stop();}          //Stop program thread
private volatile Thread blinker;
    public void stop() {                           // new method to stop thread
        blinker = null;

Answer 1

Hi there Abdullah ch,
You may find the information in the article below helpful.
iOS: Understanding Restrictions (parental controls) 
Important: If you lose or forget your Restrictions passcode, you'll need to perform a factory restore to remove it.
-Griff W.