I had the same error message.
Looking through the logs printed when doing
ionic serve
showed me a bunch of errors, all similar to this
[ng] ERROR in ./src/global.scss (./node_modules/@angular-devkit/build-angular/src/angular-cli-files/plugins/raw-css-loader.js!./node_modules/postcss-loader/src??embedded!./node_modules/sass-loader/lib/loader.js??ref--14-3!./src/global.scss)
[ng] Module build failed (from ./node_modules/sass-loader/lib/loader.js):
[ng] Error: Cannot find module 'node-sass'
[ng] Require stack:
This lead me to get the application up and running again by
npm install node-sass --save
The compilation process is sometimes spitting out rather confusing error messages from time to time, but with a little digging one can start guessing where to start poking
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