자바 에러가 뜨는데 무엇이 문제인지 모르겠어요..

번호를 입력해 주세요 :Exception in thread "main" java.util.NoSuchElementException

at java.util.Scanner.throwFor(Unknown Source)

at java.util.Scanner.next(Unknown Source)

at java.util.Scanner.nextInt(Unknown Source)

at trip.admin.board(admin.java:22)

at trip.display.main(display.java:189)

void board(nation list1[],city list2[],muse list3[], display d,sort k){

while(true){

displaymanu();

int i = s.nextInt();

switch(i){

case 1 : searchnation(list1,list2,list3,d); break;

case 2 : searchmuse(list1,list2,list3,d); break;

case 3 : displayall(list1,d); break;

case 4 : searchstar(list1,list2,list3,d); break;

case 5 : givestar(list1,list2,list3,d); break;

case 6 : giveexplain(list3,d); break;

case 7 : sorttop10(list1,list2,list3,d,k); break;

default : return;

}

이함수를 돌리는데 한번 스위치문 돌렸다가 다시 displaymanu함수가 실행되면 저런 메세지가 나오네요 ㅠㅠ