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JavaScript React Basics Thinking in Components Create a Component

The server is working but I'm getting some errors. Please help!

babel.min.js:24 You are using the in-browser Babel transformer. Be sure to precompile your scripts for production - https://babeljs.io/docs/setup/ u @ babel.min.js:24 react.js:9 Uncaught ReferenceError: ReactDom is not defined at <anonymous>:7:1 at i (babel.min.js:24) at r (babel.min.js:24) at e.src.n.<computed>.l.content (babel.min.js:24) at XMLHttpRequest.n.onreadystatechange (babel.min.js:24) :5500/favicon.ico:1 Failed to load resource: the server responded with a status of 404 (Not Found)