Why I can't run my compiled Java file ? (.class)

Question

I have compiled two files in out folder (, )

Code in Main.java (source file from Main.class) is:

import gui_pckg.Gui;
public class Main {
    public static void main(String[] args) {
        Gui gui = new Gui();
    }
}

Code from Gui.java (source file from Gui.class) is:

package  gui_pckg;
import javax.swing.*;
import java.awt.*;
public class Gui { 
    public JFrame frame = new JFrame("To Do List");
    public Gui() {
        frame.setSize(500, 800);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

Im trying to run it with cmd (Windows 10) I'm typing:

C:\Users\jindr>cd C:\Users\jindr\Desktop\todolist\out

C:\Users\jindr\Desktop\todolist\out>java Main

And it throws error:

Error: Could not find or load main class Main
Caused by: java.lang.ClassNotFoundException: Main

My Java Classpath is not broken!