<!-- Please note that your issue will be fixed much faster if you spend about half an hour preparing it, including the exact reproduction steps and a demo. If you're in a hurry or don't feel confident, it's fine to report bugs with less details, but this makes it less likely they'll get fixed soon. In either case, please use this template and fill in as many fields below as you can. Note that we don't provide help for webpack questions after ejecting. You can find webpack docs at https://webpack.js.org/. --> ### Describe the bug ### npm start not working ### Did you try recovering your dependencies? I follow all the steps but not working!! <!-- Your module tree might be corrupted, and that might be causing the issues. Let's try to recover it. First, delete these files and folders in your project: * node_modules * package-lock.json * yarn.lock Then you need to decide which package manager you prefer to use. We support both npm (https://npmjs.com) and yarn (https://yarnpkg.com/). However, **they can't be used together in one project** so you need to pick one. If you decided to use npm, run this in your project directory: npm install -g npm@latest npm install This should fix your project. If you decided to use yarn, update it first (https://yarnpkg.com/en/docs/install). Then run in your project directory: yarn This should fix your project. Importantly, **if you decided to use yarn, you should never run `npm install` in the project**. For example, yarn users should run `yarn add <library>` instead of `npm install <library>`. Otherwise your project will break again. Have you done all these steps and still see the issue? Please paste the output of `npm --version` and/or `yarn --version` to confirm. --> ### Environment <!-- To help identify if a problem is specific to a platform, browser, or module version, information about your environment is required. This enables the maintainers quickly reproduce the issue and give feedback. Run the following command in your React app's folder in terminal. Note: The result is copied to your clipboard directly. `npx create-react-app --info` Paste the output of the command in the section below. --> windows 10 "react": "^17.0.2" 