Java Database Connectivity (JDBC)

I got this message " java.sql.SQLException: Parameter index out of range (0 < 1 ) " when i try to pass data from a servlet to mysql database using a stored procedure and callable statement. i have to pass 13 parameters stored in array.
Please help me
Here is the code

Connection con=null;
	CallableStatement proc = null;
    try 
	{
	  Class.forName("com.mysql.jdbc.Driver").newInstance();
      con = DriverManager.getConnection("jdbc:mysql:///projectclaire", "root", "");
      proc = con.prepareCall("{ call do_upcli(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) }");
	  for (int k=0;k <elts.length;k++)
      {
       proc.setString(k, elts[k]);
      } 
	  proc.setInt(13, b2);
	  proc.setInt(14, b3);
      proc.execute();
      response.sendRedirect("http://localhost:8080/uct/success3.jsp");;
	  proc.close();
	} 
   catch(Exception e) 
    {
      System.err.println("Exception: " + e.getMessage());
	  out.println(e);
	  out.println(e.getMessage());
	  
    }