What does the error "Starting Metro" mean in a React Native App with NPM?

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The error "Starting Metro" in a React Native app with NPM usually means that there is an issue with the construction of the project environment, such as an outdated or missing package, misconfigured files, or a problem with the development server. Metro is the JavaScript bundler used by React Native. Troubleshooting steps include checking for outdated dependencies and updating them, clearing the cache with npm cache clean, deleting node_modules and running npm install again, and checking for errors or warnings in the console output. It can also be caused by a firewall or antivirus program interfering with the development server's ports.