esthrelar

<pre class="hljs"><code>ReactDOM.render(
 <Provider 
 store={createStoreWithMiddleware(rootReducer
 ,
 window.__REDUX_DEVTOOLS_EXTENSION__ &&
 window.__REDUX_DEVTOOLS_EXTENSION__()
 )}
 > 
 <App />
 </Provider>
 
 , document.getElementById('root')
);</code></pre>이 부분을<pre class="hljs"><code>const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
 <Provider 
 store={createStoreWithMiddleware(rootReducer
 ,
 window.__REDUX_DEVTOOLS_EXTENSION__ &&
 window.__REDUX_DEVTOOLS_EXTENSION__()
 )}
 > 
 <App />
 </Provider>
 
 , document.getElementById('root')
);</code></pre>이렇게 수정하니 되었습니다 :) 혹시 같은 문제를 겪는 분이 계실까봐 댓글로 그냥 남겨두겠습니다!

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