Exception in thread "main" java.lang.IllegalStateException: Task already scheduled or cancelled

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class TimerTest {

    public static void main(String[] args) {
        Timer timer = new Timer();
        MyTask.getInstance().cancel();
        timer.scheduleAtFixedRate(MyTask.getInstance(), new Date(), 1000);
    }

}

class MyTask extends TimerTask {

    private static MyTask instance = new MyTask();

    private MyTask() {
    }
    
    public static MyTask getInstance(){
        return instance;
    }

    @Override
    public void run() {
        System.out.println(1);
    }
}