Can't resolve 'sass-loader'

The error message "Can't resolve 'sass-loader'" typically occurs when the sass-loader module is not found or is not installed in your project.

To resolve this issue, you can follow these steps:

1. Make sure you have installed sass-loader as a dependency in your project. You can do this by running the following command:

   npm install sass-loader

If you are using Yarn, you can run:

   yarn add sass-loader

2. Verify that sass-loader is listed as a dependency in your package.json file.

3. If you have recently installed sass-loader, try deleting the node_modules folder and re-installing all dependencies by running either `npm install` or `yarn` command.

4. Check if your webpack or build configuration is correctly set up to use sass-loader. Ensure that you have included sass-loader in the loaders section of your webpack config file.

For example, your webpack config might have a rule like this:

   module: {
     rules: [
       {
         test: /\.scss$/,
         use: [
           'style-loader',
           'css-loader',
           'sass-loader'
         ]
       }
     ]
   }

5. After making any changes to your configuration, restart your development server to see if the issue is resolved.

By following these steps, you should be able to resolve the "Can't resolve 'sass-loader'" error.