Soy nuevo en la codificación y reacción. Estoy siguiendo este tutorial, https://www.youtube.com/watch?v=3kYkEVIZNZY&t=1503s . Todo iba bien hasta ahora. Estoy tratando de ejecutar mi código y recibo este error.

 import global from 'jss-plugin-global'; import nested from 'jss-plugin-nested'; import camelCase from 'jss-plugin-camel-case'; import defaultUnit from 'jss-plugin-default-unit'; import vendorPrefixer from 'jss-plugin-vendor-prefixer'; import propsSort from 'jss-plugin-props-sort'; // Subset of jss-preset-default with only the plugins the Material-UI components are using. export default function jssPreset() { return { plugins: [functions(), global(), nested(), camelCase(), defaultUnit(), // Disable the vendor prefixer server-side, it does nothing. // This way, we can get a performance boost. // In the documentation, we are using `autoprefixer` to solve this problem. typeof window === 'undefined' ? null : vendorPrefixer(), propsSort()] }; }``` when I do **npm run dev** I get no error from the console but however if I try to load the page on the browser, I get this error [enter image description here][1] [1]: https://i.stack.imgur.com/fXWNR.png please I need assistance I have tried fixing this error for weeks