How can I debug a Webpack error during 'npm run build' when the error message is unhelpful?

Start by running Webpack in development mode (`npm run dev` or similar) to get more detailed error messages. Use the `--mode development` flag with the webpack command directly. Check your console for more verbose output. Consider using the `webpack-bundle-analyzer` to visualize your bundle and identify large or problematic modules. Also, try commenting out sections of your Webpack configuration to isolate the issue.