Fix error in styles.scss class does not exist. Module build failed (from ./node_modules/postcss-loader/dist/cjs.js): Read more about Fix error in styles.scss class does not exist. Module build failed (from ./node_modules/postcss-loader/dist/cjs.js): I had this error on a Typescript Angular project, where my Tailwind css could not be compiled every time I created a new component in my angular cli. I was able to fix it: Put chmod -R 777 * as access rights on your node_modules folder. Thanks to this user: https://stackoverflow.com/a/54033562/3280710