How to open a JFrame in different package from another JFrame which is in other differernt package but in the same project

Question

I am doing a demo project, where this time I have created different packages and put some different JFrames in those packages.

I want it to open when I call the JFrame of a different package from the JFrame of another package.

But, I have three packages, one of which is package com.mkw.adminpanel; which contain a JFrame named Admin And by clicking the button here I want package com.mkw.loginpanel; To open the JFrame named Start inside. But it is not opening.And package com.mkw.studentpanel; The frame named Start inside this package is opening.

the package named package com.mkw.adminpanel; code of JButton actionperformed is given below:

package com.mkw.adminpanel;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import com.mkw.studentpanel.Start;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Admin extends JFrame {
private JPanel contentPane;
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Admin frame = new Admin();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}
public Admin() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);
    
    JButton btnNewButton = new JButton("New button");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            dispose();
            Start s = new Start();
            s.setVisible(true);
        }
    });
    btnNewButton.setBounds(175, 182, 89, 23);
    contentPane.add(btnNewButton);
   }
}