NoSuchElementException错误

NoSuchElementException错误，在自己的电脑里操作时没有错误，不知道为啥？

Test.java里的代码:

import java.util.Scanner;

public class Test{

  public static void main(String[] args) {

User yonghu1 = new User("Lucy",123456);

    User yonghu2 = new User("Mike",123456);

    while(true) {

   Scanner sc = new Scanner(System.in);

    System.out.print("用户名:");

//String h=sc.next();

UserManager a = new UserManager();

a.name = sc.next();

     if(a.checkUser(yonghu1, yonghu2)=="无此用户") {continue;}

System.out.print("密码:");

int t = sc.nextInt();

a.miMa = t;

a.checkmiMa(yonghu1, yonghu2);

    }

}

}

User里的代码:

public class User{

         //定义属性用户名、密码

    private String name;

    private int miMa;

   public User(String name,int miMa){

    this.setName(name);

    this.setmiMa(miMa);

        }

    private void setName(String name){

        this.name = name;

    }

    private void setmiMa(int miMa) {

    this.miMa = miMa;

    }

    public String getName(){

    return name;

    }

    public int getmiMa(){

        return miMa;

        }

}

UserManager里的代码:

public class UserManager{

   String name;

int miMa;

public String checkUser(User one, User two) {

String s = this.name;

String A = one.getName();

String B = two.getName();

if (s.equals(A)||s.equals(B)) {

return "";

}else {

System.out.println("无此用户");

return "无此用户";

}

}

public String checkmiMa(User one,User two) {

if ((this.miMa == one.getmiMa()) || (this.miMa == two.getmiMa())) {

return "";

}else {

System.out.println("密码错误");

return "密码错误";}

}

}

NoSuchElementException错误

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