Exception in thread "main" java.lang.error: unresolved compilation problem: at cubeanimation.samplecuberotate3d.main(samplecuberotate3d.java:69)

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Java

import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.*;
import javax.swing.*;
import javax.vecmath.Point3d;
 import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
 
//JFrame class inherits the code from the Swing JPanel class.
public class SampleCubeRotate3D extends JPanel {
 
    //The constructor method
    public SampleCubeRotate3D() {
 
        //Set the layout, this is just a standard thing.
        setLayout(new BorderLayout());

more codes but i just end here

public static void main(String[] args) {
       //Set the No Erase Background property to true
       System.setProperty("sun.awt.noerasebackground", "true");

       //Disable the JPopupMenu
       JPopupMenu.setDefaultLightWeightPopupEnabled(false);

       //Create an instance for the ToolTipManager
       ToolTipManager ttm = ToolTipManager.sharedInstance();

       //Disable the ToolTipManager
       ttm.setLightWeightPopupEnabled(false);

       //Create object instance
       SampleCubeRotate3D main = new SampleCubeRotate3D();

       //Create new JFrame instance
       JFrame frame = new JFrame("Just Java 3D - Spinning Cube!");

       //Set the size of the JFrame
       frame.setSize(750, 500);

       //The frame will now hold the main canvas
       frame.getContentPane().add(main);

       //Make sure the frame is actually visible
       frame.setVisible(true);
   }

after i run the error is in static void main

What I have tried:

tried checking the import and the properties