'react-scripts' is not recognized as an internal or external command on npm run build code example

Example 1: react-scripts is not recognized as an internal command windows

//If you transfered Your Project from another machime or from github then just 
//Install react-scripts again !! 

//UP vote if it helped you !

npm i -g react-scripts

Example 2: 'react-scripts' is not recognized as an internal or external command,

file not fond problem 
rm -rf node_modules && npm install