React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.
이런 에러나서 한참 해멨는데
react-router가 아니라 react-router-dom 이다.
아우 왜 사람 헷갈리게 비슷한게 많은지 ㅜㅜ
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