title: Unable to build react app using npm run build - Exit status 1
body: <p>I have created a react app using create-react-app, and when I first tried to build it using npm run build, it was working fine. However, after a couple of days of developing when I try to run the same command, I'm facing the following issue.</p>
  
  <pre><code>0 info it worked if it ends with ok
  1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
  1 verbose cli   'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm- 
  cli.js',
  1 verbose cli   'run',
  1 verbose cli   'build' ]
  2 info using npm@5.6.0
  3 info using node@v8.11.4
  4 verbose run-script [ 'prebuild', 'build', 'postbuild' ]
  5 info lifecycle nic-react@0.1.0~prebuild: nic-react@0.1.0
  6 info lifecycle nic-react@0.1.0~build: nic-react@0.1.0
  7 verbose lifecycle nic-react@0.1.0~build: unsafe-perm in lifecycle true
  8 verbose lifecycle nic-react@0.1.0~build: PATH: C:\Program 
  Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp- 
  bin;C:\Users\myaccount\nic-react\node_modules\.bin;C:\Program Files\Common 
  Files\Microsoft Shared\Microsoft Online Services;C:\Program Files 
  (x86)\Common Files\Microsoft Shared\Microsoft Online Services;C:\Program 
  Files (x86)\Common Files\Volvo\VCOM Client\dll;C:\Program Files\Common 
  Files\Volvo\VCOM Client\dll;C:\Program Files (x86)\Java\jre1.6.0_20\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Microsoft Windows Performance Toolkit\;C:\Program Files\dotnet\;C:\Program Files\Volvo\VCOM Server\bin;C:\Program Files\Microsoft SQL Server\120\DTS\Binn\;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files\Microsoft SQL Server\120\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\120\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft SQL Server\120\DTS\Binn\;C:\Program Files (x86)\Volvo\VComDNA\bin;C:\Program Files\IBM\WebSphere MQ\bin64;C:\Program Files\IBM\WebSphere MQ\bin;C:\Program Files\IBM\WebSphere MQ\tools\c\samples\bin;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files (x86)\Microsoft Team Foundation Server 2015 Power Tools\;C:\Program Files (x86)\LINQPad5;C:\ProgramData\chocolatey\bin;C:\Program Files (x86)\dotnet\;C:\Program Files\Microsoft VS Code\bin;C:\Program Files\nodejs\;C:\Program Files\Git\cmd;C:\Users\myaccount\AppData\Local\Programs\Fiddler;C:\Program Files\Microsoft VS Code\bin;C:\Users\myaccount\.dotnet\tools;C:\Users\myaccount\AppData\Roaming\npm;C:\Users\myaccount\AppData\Local\Programs\Microsoft VS Code\bin
  9 verbose lifecycle nic-react@0.1.0~build: CWD: C:\Users\myaccount\nic-react
  10 silly lifecycle nic-react@0.1.0~build: Args: [ '/d /s /c', 'node 
  scripts/build.js' ]
  11 silly lifecycle nic-react@0.1.0~build: Returned: code: 1  signal: null
  12 info lifecycle nic-react@0.1.0~build: Failed to exec build script
  13 verbose stack Error: nic-react@0.1.0 build: `node scripts/build.js`
  13 verbose stack Exit status 1
  13 verbose stack     at EventEmitter.&lt;anonymous&gt; (C:\Program 
  Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:285:16)
  13 verbose stack     at emitTwo (events.js:126:13)
  13 verbose stack     at EventEmitter.emit (events.js:214:7)
  13 verbose stack     at ChildProcess.&lt;anonymous&gt; (C:\Program 
  Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
  13 verbose stack     at emitTwo (events.js:126:13)
  13 verbose stack     at ChildProcess.emit (events.js:214:7)
  13 verbose stack     at maybeClose (internal/child_process.js:925:16)
  13 verbose stack     at Process.ChildProcess._handle.onexit 
  (internal/child_process.js:209:5)
  14 verbose pkgid nic-react@0.1.0
  15 verbose cwd C:\Users\myaccount\nic-react
  16 verbose Windows_NT 6.1.7601
  17 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program 
   Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "build"
  18 verbose node v8.11.4
  19 verbose npm  v5.6.0
  20 error code ELIFECYCLE
  21 error errno 1
  22 error nic-react@0.1.0 build: `node scripts/build.js`
  22 error Exit status 1
  23 error Failed at the nic-react@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 ]
  </code></pre>
  
  <p>I've have been looking around in StackOverflow but I can't seem to find anything similar to my problem. Usually there is some kind of specific error message, but I can't see it.</p>
  
  <p>Here is my package.json:</p>
  
  <pre><code>{
   "name": "nic-react",
   "version": "0.1.0",
   "private": true,
   "dependencies": {
   "@fortawesome/fontawesome-svg-core": "^1.2.7",
   "@fortawesome/free-solid-svg-icons": "^5.4.2",
   "@fortawesome/react-fontawesome": "^0.1.3",
   "autoprefixer": "7.1.6",
   "axios": "^0.18.0",
   "babel-core": "6.26.0",
   "babel-eslint": "7.2.3",
   "babel-jest": "20.0.3",
   "babel-loader": "7.1.2",
   "babel-preset-react-app": "^3.1.2",
   "babel-runtime": "6.26.0",
   "case-sensitive-paths-webpack-plugin": "2.1.1",
   "chalk": "1.1.3",
   "chart.js": "^2.7.3",
   "core-js": "^2.5.7",
   "css-loader": "0.28.7",
   "dotenv": "4.0.0",
   "dotenv-expand": "4.2.0",
   "eslint": "4.10.0",
   "eslint-config-react-app": "^2.1.0",
   "eslint-loader": "1.9.0",
   "eslint-plugin-flowtype": "2.39.1",
   "eslint-plugin-import": "2.8.0",
   "eslint-plugin-jsx-a11y": "5.1.1",
   "eslint-plugin-react": "7.4.0",
   "extract-text-webpack-plugin": "3.0.2",
   "file-loader": "1.1.5",
   "fs-extra": "3.0.1",
   "html-webpack-plugin": "2.29.0",
   "i": "^0.3.6",
   "jest": "20.0.4",
   "moment": "^2.22.2",
   "object-assign": "4.1.1",
   "postcss-flexbugs-fixes": "3.2.0",
   "postcss-loader": "2.0.8",
   "promise": "8.0.1",
   "query-string": "^5.1.1",
   "raf": "3.4.0",
   "react": "^16.6.0",
   "react-bootstrap": "^0.32.4",
   "react-bootstrap-table": "^4.3.1",
   "react-chartjs-2": "^2.7.4",
   "react-copy-to-clipboard": "^5.0.1",
   "react-countup": "^4.0.0",
   "react-dev-utils": "^5.0.3",
   "react-flatpickr": "^3.6.4",
   "react-moment": "^0.7.9",
   "react-router-bootstrap": "^0.24.4",
   "react-router-dom": "^4.3.1",
   "react-select": "^2.1.1",
   "react-spinners": "^0.4.7",
   "react-toastify": "^4.4.0",
   "react-toggle": "^4.0.2",
   "resolve": "1.6.0",
   "style-loader": "0.19.0",
   "sw-precache-webpack-plugin": "0.11.4",
   "toastify": "^1.0.12",
   "url-loader": "0.6.2",
   "uuid": "^3.3.2",
   "webpack": "3.8.1",
   "webpack-dev-server": "2.11.3",
   "webpack-manifest-plugin": "1.3.2",
   "whatwg-fetch": "2.0.3",
   "xml-formatter": "^1.0.1"
  }, 
   "scripts": {
   "start": "node scripts/start.js",
   "build": "node scripts/build.js",
   "test": "node scripts/test.js --env=jsdom"
  },
  "jest": {
    "collectCoverageFrom": [
     "src/**/*.{js,jsx,mjs}"
    ],
    "setupFiles": [
     "&lt;rootDir&gt;/config/polyfills.js"
   ],
   "testMatch": [
     "&lt;rootDir&gt;/src/**/__tests__/**/*.{js,jsx,mjs}",
     "&lt;rootDir&gt;/src/**/?(*.)(spec|test).{js,jsx,mjs}"
   ],
   "testEnvironment": "node",
   "testURL": "http://localhost",
  "transform": {
    "^.+\\.(js|jsx|mjs)$": "&lt;rootDir&gt;/node_modules/babel-jest",
    "^.+\\.css$": "&lt;rootDir&gt;/config/jest/cssTransform.js",
    "^(?!.*\\.(js|jsx|mjs|css|json)$)": "&lt;rootDir&gt;/config/jest/fileTransform.js"
  },
  "transformIgnorePatterns": [
    "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs)$"
  ],
  "moduleNameMapper": {
    "^react-native$": "react-native-web"
  },
  "moduleFileExtensions": [
    "web.js",
    "js",
    "json",
    "web.jsx",
    "jsx",
    "node",
    "mjs"
     ]
  },
    "babel": {
     "presets": [
     "react-app"
      ]
    },
  "eslintConfig": {
    "extends": "react-app"
  }
  }
  </code></pre>
  
  <p>Thanks in advance.</p>