JAVA数据库连接的错误，急！！

我是与Access连接的
但是报出这样的错误：
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] 参数不足，期待是 3。
我其中的代码是这样的：
     String sql="select * from card where carid=? and password=?";
                    preStmt=con.getConnection().prepareStatement(sql);
                    preStmt.setString(1,cardField.getText().trim());
                    preStmt.setString(2,passwordField.getText().trim());
                    rs=preStmt.executeQuery();
                    if (rs.next()){
                        JOptionPane.showMessageDialog(frame,
                                "对不起您的密码与卡号不匹配，请您重新输入！",
                                "警告",
                                JOptionPane.OK_CANCEL_OPTION, null);
                        return;                    }
                    else  {
                    JOptionPane.showMessageDialog(frame, "欢迎进入本网吧，希望您玩的愉快！",
                                                  "恭喜",
                                                JOptionPane.OK_CANCEL_OPTION, null);
                    return;
                }                } catch (SQLException ex) {
                    System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~~~~");
                    System.out.println("密码和卡号检验不成功！");
                    ex.printStackTrace();                }感觉代码是应该没有问题的
这里我稍微解释一下：
con.getConnection()是一个Connection并且连接是成功的
prestmta是PreparedStatement对象！