Step 1: $ npm cache clean --force
Step 2: Delete node_modules by $ rm -rf node_modules (rmdir /S /Q node_modules in windows) folder or delete it manually by going into the directory and right-click > delete / move to trash. If are not updating your packages you can delete the 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: Still if it is there, kindly check the error it is displaying in red and act accordingly. This error is specific to node.js environment. Happy Coding!!