Node Sass version 5.0.0 is incompatible with ^4.0.0. yarn code example
Example 1: Error: Node Sass version 5.0.0 is incompatible with ^4.0.0.
with npm =>
1.npm uninstall node-sass
2.npm install node-sass@4.14.1
with yarn =>
1.yarn remove node-sass
2.yarn remove node-sass@4.14.1
Example 2: Error: Node Sass version 5.0.0 is incompatible with ^4.0
npm uninstall node-sass
npm install node-sass@4.14.1
Or, if using yarn (default in newer CRA versions)
yarn remove node-sass
yarn add node-sass@4.14.1