Erro no java

/*
    A basic extension of the java.applet.Applet class
 */

import java.awt.*;
import java.applet.*;

public class SingleJointDemo extends Applet {
	SingleJoint s3d ;
	Vrml2Java vj ;

	public void init() {
		super.init();

		addNotify();
		setBackground ( new Color ( 255, 255, 196 ) ) ;

		try {
			vj = new Vrml2Java ( this ) ;
		}
		catch ( UnsatisfiedLinkError err ) {
		}

		s3d = new SingleJoint ( vj, "joint" ) ;
		add ( s3d ) ;
		s3d . reshape ( 5, 5, 110, 190 ) ;

		s3d . addXDetent ( "Thigh Horizontal", " ", 1.0F ) ;
		s3d . addXDetent ( "Thigh 45", " ", 0.5F ) ;
		s3d . addXDetent ( "Thigh Vertical", " ", 0.0F ) ;

		s3d . addYDetent ( "Thigh Out", " ", 1.0F ) ;
		s3d . addYDetent ( "Thigh Down", " ", 0.0F ) ;

		s3d . addZDetent ( "Thigh Straight", " ", 0.0F ) ;
	}

	public boolean handleEvent(Event event) {
		if ( event . id == Event . ACTION_EVENT
			&& event . target == s3d ) {
			//System . out . println ( "Pos="+s3d.getXPos()+","+s3d.getYPos()+","+s3d.getZPos());
		}
		return super.handleEvent(event);
	}
}