Step 1: $ npm cache clean --force
Step 2: Delete node_modules by $ rm -rf node_modules package-lock.json folder or delete it manually by going into the directory and right-click > delete / move to trash. Also, delete package-lock.json file too.
Step 3: npm install
To start again, $ npm start
This worked for me. Hopes it works for you too.
PS: If it is still there, kindly check the error it is displaying in red and act accordingly. This error is specific to node.js environment.
A special thanks to - Prakhar Mittal (https://stackoverflow.com/users/9478145/prakhar-mittal)