코드를 치고 화면을 렌더링 하니 이런 오류가 떴다. 겁먹지 말고, 첫번째 오류부터 해결해나가보겠다.... react.development.js:209 Warning: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons: 1. You might have mismatching versions of React and the renderer (such as React DOM) 2. You might be breaking the Rules of Hooks 3. You might have more than one copy..
