Duplicate Sass Dependencies
Why This Error Occurred​
Your project has a direct dependency on both sass and node-sass, two
different packages that both compile Sass files!
Next.js will only use one of these, so it is suggested that you remove one or the other.
Possible Ways to Fix It​
The sass package is a modern implementation of Sass in JavaScript that
supports all the new features and does not require any native dependencies.
Since sass is now the canonical implementation, we suggest removing the older
node-sass package, which should speed up your builds and project install time.
Via npm
npm uninstall node-sass
Via Yarn
yarn remove node-sass