子类名称提示错误，不知道为什么，求大神帮看看

主程序

package app;

public class App {

public static void main(String[] args) throws Exception {

Auto audi = new Auto(1,"Audi A4",500,4,0);

}

}

父类

package app;

public class Auto {

int num;

String name;

int price;

int passengers;

int carry;

public  Auto(int newnum,String newname,int newprice,int newpassengers,int newcarry) {

num = newnum;

name = newname;

price = newprice;

passengers = newpassengers;

carry = newcarry;

System.out.println(num+".  "+name+"  "+price+" yuan/perday   passenge:"+passengers);

}

}

子类

package app;

public class AudiA4 extends Auto{

}

子类名称提示错误：

Implicit super constructor Auto() is undefined for default constructor. Must define an explicit constructor

这是为什么？