Start:applet not initilaized error

Hi friends,
I'm getting Start:applet not initilaized error when i'm running a program...
saved a notepad file as Testloan.java used javac Testloan.java and appletviewer Testloan.java to execute the applet here is my code...
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
<html>
<applet code="Testloan.class" width=300 height=100>
</applet>
</html>
public class Testloan extends Applet implements ActionListener
TextField t1,t2,t3;
Label lp,lr,lmp;
Button b1,b2;
     public void init()
     lp=new Label("Principal");
     lr=new Label("Rate");
     lmp=new Label("Payment");
     add(lp);
     add(lr);
     add(lmp);
     t1=new TextField();
     add(t1);
     t2=new TextField();
     add(t2);
     t3=new TextField();
     add(t3);
     b1=new Button("submit");
     add(b1);
     b1=new Button("Exit");
     add(b2);
     b1.addActionListener(this);
b2.addActionListener(this);
public void start() {
//win.setVisible(true);
public void stop() {
//win.setVisible(false);
public static int months(int principal,double rate,int payment)
          Testloan tl=new Testloan();
          principal=Integer.parseInt(tl.t1.getText());
          rate=Double.parseDouble(tl.t2.getText());
          payment=Integer.parseInt(tl.t3.getText());
          int p=principal;
          double eRate = rate / 1200.0;
          int month =0,np=1;
               while(np>0)
               month = month + 1;
               np= (int) (p*(1+eRate)-payment );
               System.out.println(np+"/n");
               p = np;
          return month;
public void actionPerformed(ActionEvent e)
String cmd = e.getActionCommand();
}

First, the code you posted was mangled by the forum formatting software. When you post code, select it and click the CODE button above the typing area, which will prevent that, and maintain your formatting.
When you ran the appletviewer program from the cmd window, error information was posted to it by the java command. Did you look at it? It says that you have a NullPointerException at this line
add(b2);because there's a typo in this line
b1 = new Button("Exit");which should have assigned a value to b2, not b1
Read and understand the error messages that java creates, they almost always point exactly at the problem and allow you to debug the cause.

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