Invariant Violation: Calling PropTypes validators directly is not supported by the prop-types package. Use `PropTypes.

Invariant Violation: Calling PropTypes validators directly is not supported by the prop-types package. Use PropTypes.checkPropTypes() to call them. Read more at http://fb.me/use-check-prop-types

propTypes 설정 잘못 했을 때 위 에러가 발생한다.

다시 한번 확인하자.