cat425

저와 같은 경우라면 구글 검색해 보니 아래와 같은 내용이 있네요 전 해결 했습니다.&nbsp;
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순서 변경 첫번째 react, 두번재 react-dom
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You need to switch the load order of the scripts. Load react first, then react-dom. On the JS tab in the Codepen settings, you can grab the icon on the left of the script and drag its position up or down.

cat425

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