react production build not working code example

Example: react npm build not working

"name": "louis_raymond_blue_harvest_challenge",  "version": "0.1.0",  "homepage":".",  "private": true,  "dependencies": {    "bootstrap": "^4.2.1",    "jquery": "^3.3.1",    "popper.js": "^1.14.7",    "react": "^16.7.0",    "react-bootstrap": "^1.0.0-beta.5",    "react-dom": "^16.7.0",    "react-scripts": "2.1.3"  },