Failed to resolve loader: sass-loader You may need to install it.

To resolve the "Failed to resolve loader: sass-loader" error, you need to make sure that the sass-loader is installed in your project.

You can install sass-loader by running the following command in your project directory:

npm install sass-loader --save-dev

If you are using Yarn, you can run:

yarn add sass-loader --dev

After installing sass-loader, you might need to restart your development server or bundler for the changes to take effect.