Colmun index out of range

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.sql.*;




import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;





public class Application {
 
 
 
 
 
 JFrame f= new JFrame("gestion des interventions");
 JTable tab= new JTable();
 JMenu del= new JMenu("DELETE");
 JMenu add= new JMenu("INSERT");
 JMenu up= new JMenu("UPDATE");
 
 JMenuBar jmb= new JMenuBar();
 
 JPanel p2= new JPanel();
 JPanel p=new JPanel();
 
 JLabel title=new JLabel("**** LISTE DES EMPLOYES ****");
 String[] filtre= {"id-emp","age","grade","Nom"};
 JComboBox cm=new JComboBox(filtre);
 
 public Application()  {
 f.setSize(700, 700);
 f.setLocation(50, 10);
 
   f.setVisible(true);
   f.add(p,BorderLayout.NORTH);
 
   f.add(p2,BorderLayout.SOUTH);
   f.setJMenuBar(jmb);
   p2.setLayout(new GridLayout(2, 3, 10, 10));
   p.add(title);   
   p.add(new JScrollPane(tab));

p2.add(new JLabel("Filtrer par:")); 
p2.add(cm);
p2.add(new JTextField(10));
p2.add(new JLabel("import/export:"));
p2.add(new JButton("export"));
p2.add(new JButton("import"));

 


 jmb.add(add);
 jmb.add(del);
 jmb.add(up);
 
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 /*add.addActionListener(new ActionListener() {
  
  public void actionPerformed(ActionEvent ae) {
   // TODO Auto-generated method stub
   if (ae.getSource()==add)
   {
    try{
     
     
     Class.forName("com.mysql.jdbc.Driver");
     Connection cnx = DriverManager.getConnection("jdbc:mysql://localhost:3306/intervention", "root", "");
   
     
        java.sql.Statement stm=cnx.createStatement();
       int nb = stm.executeUpdate("INSERT INTO `intervention`.`intervention` (`id`, `description`, `durée`, `supervisuer`, `emplacement`, `outils`, `main_oeuvre`) VALUES (NULL, 'zedfzdef', 'zef', 'zderfe', 'zefz', 'efrze', '1'");
       
      } catch (ClassNotFoundException e) {
       e.printStackTrace();// TODO: handle exception
      }
    catch (SQLException se)
    {
     se.printStackTrace();
    }
   }
  }
 });*/
 try{
 
 
  Class.forName("com.mysql.jdbc.Driver");
  Connection cnx = DriverManager.getConnection("jdbc:mysql://localhost:3306/application", "root", "");
  
     java.sql.Statement stm = cnx.createStatement();
    ResultSet rs=stm.executeQuery("select * from employe where 1=1");
   
    
    ResultSetMetaData md = rs.getMetaData();
    int nc = md.getColumnCount();
    String[] columns = new String[nc];
    for (int i = 0; i <= nc; i++) {
     columns[i]=md.getColumnName(i+1);
    }
    int nl=0;
    while(rs.next())
    
     
     nl++;
    
    rs.first();
    String[][] data = new String[nl][nc];
    for (int m = 0; m < nl; m++) {
     
     for (int n = 0; n <= nc; n++) {
      data[m][n] = rs.getString(n + 1);
      rs.next();
     }
    } 
    
    TableModel dtm = new DefaultTableModel(data,columns);
    tab.setModel(dtm); 
   } catch (Exception e) {
    e.printStackTrace();// TODO: handle exception
                                      }
         
   
 }
 public static void main(String[] args) {
  // TODO Auto-generated method stub
new Application(); 
 }

}