npm run build elifecycle

I am new to react and i want to create production build out of my code. But when i run 'npm rub build' it gives me this error in .log file

0 info it worked if it ends with ok

1 verbose cli [ '/usr/local/Cellar/node/9.11.1/bin/node',

1 verbose cli '/usr/local/bin/npm',

1 verbose cli 'run',

1 verbose cli 'build' ]

2 info using npm@5.6.0

3 info using node@v9.11.1

4 verbose run-script [ 'prebuild', 'build', 'postbuild' ]

5 info lifecycle jenna-web-frontend@0.1.0~prebuild: jenna-webfrontend@0.1.0

6 info lifecycle jenna-web-frontend@0.1.0~build: jenna-web-frontend@0.1.0

7 verbose lifecycle jenna-web-frontend@0.1.0~build: unsafe-perm in lifecycle true

8 verbose lifecycle jenna-web-frontend@0.1.0~build: PATH: /usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/Users/markopetricic/Documents/Projects/staging-jenna-web-front/node_modules/.bin:/Library/Frameworks/Python.framework/Versions/3.6/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

9 verbose lifecycle jenna-web-frontend@0.1.0~build: CWD: /Users/markopetricic/Documents/Projects/staging-jenna-web-front

10 silly lifecycle jenna-web-frontend@0.1.0~build: Args: [ '-c', 'react-scripts build' ]

11 silly lifecycle jenna-web-frontend@0.1.0~build: Returned: code: 1 signal: null

12 info lifecycle jenna-web-frontend@0.1.0~build: Failed to exec build script

13 verbose stack Error: jenna-web-frontend@0.1.0 build: react-scripts build

13 verbose stack Exit status 1

13 verbose stack at EventEmitter. (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:285:16)

13 verbose stack at EventEmitter.emit (events.js:180:13)

13 verbose stack at ChildProcess. (/usr/local/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)

13 verbose stack at ChildProcess.emit (events.js:180:13)

13 verbose stack at maybeClose (internal/child_process.js:936:16)

13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:220:5)

14 verbose pkgid jenna-web-frontend@0.1.0

15 verbose cwd /Users/markopetricic/Documents/Projects/staging-jenna-web-front

16 verbose Darwin 17.3.0

17 verbose argv "/usr/local/Cellar/node/9.11.1/bin/node" "/usr/local/bin/npm" "run" "build"

18 verbose node v9.11.1

19 verbose npm v5.6.0

20 error code ELIFECYCLE

21 error errno 1

22 error jenna-web-frontend@0.1.0 build: react-scripts build

22 error Exit status 1

23 error Failed at the jenna-web-frontend@0.1.0 build script.

23 error This is probably not a problem with npm. There is likely additional logging output above.

24 verbose exit [ 1, true ]

this is package.json

{
  "name": "jenna-web-frontend",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "cookieconsent": "^3.0.6",
    "jquery": "^3.3.1",
    "react": "^16.3.0",
    "react-dom": "^16.3.0",
    "react-fade-in": "^0.1.5",
    "react-router-dom": "^4.2.2",
    "react-s3": "^1.2.4",
    "react-s3-uploader": "^4.8.0",
    "react-scripts": "1.1.1",
    "react-stay-scrolled": "^2.1.1",
    "sfcookies": "^1.0.2",
    "socket.io-client": "^2.1.0"
  },
  "scripts": {
    "start": "set PORT=3001 && react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }
}

do you have any idea why this happened?