SQL ERROR while executing the code java.sql.SQLException: ORA-01008: not all variables bound

Hi all
i'm getting the above error
plz tell me how to solve that error
the code snippet is as bellow

    while(rst.next()){
                con1=DriverManager.getConnection(url2,"rcxdev1","rcxdev1");
         PreparedStatement pstmt=null;
           pstmt=con1.prepareStatement(sb.toString());
           for(int i=0;i<mp.size();i++){

            if((mp.get(rst.getMetaData().getColumnLabel(i+1)).equals("NUMBER")))
           {
           pstmt.setInt(i+1,rst.getInt(i+1));
           System.out.println("number "+i+" "+rst.getInt(i+1));
           }

            if((mp.get(rst.getMetaData().getColumnLabel(i+1)).equals("VARCHAR2")))
   {
   pstmt.setString(i+1,rst.getString(i+1));
   System.out.println("char2 "+i+" "+rst.getString(i+1));
   }

        if((mp.get(rst.getMetaData().getColumnLabel(i+1)).equals("DATE")))
   {
           pstmt.setDate(i+1,rst.getDate(i+1));
           System.out.println("date "+i+" "+rst.getDate(i+1));
   }

        if((mp.get(rst.getMetaData().getColumnLabel(i+1)).equals("CHAR")))
                    {
       pstmt.setString(i+1,rst.getString(i+1));
       System.out.println("char");
                    }
           }

           pstmt.executeUpdate(sb.toString());
           pstmt.close();
            }
            con1.close();

                }catch(Exception e){
                    e.printStackTrace();
                }