Question 2: What is the most common reason for an error message 'module not found' when running 'npm run dev'?

The most common reason for this error is that the module you're trying to import is not installed in your project's dependencies or is not correctly configured to be available to the development environment. This often happens if you haven't run `npm install` or if the module is listed in a `node_modules` directory that isn't being included in your `package.json`.