TypeError: undefined is not iterable

TypeError: undefined is not iterable

배열을 인자로 갖는 메소드에서 문법 오류가 났을 때 나는 에러

TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))
    at file:///Users/jiwoo/Desktop/Code-States/section-2/im-sprint-async-and-promise/part-3/02_promiseAll.js:12:9