title: expo start command not running
body: <p>Using expo to work on my react native projects using <code>expo start</code> always worked before. Now it doesn't work, so I reinstalled <code>node.js</code>. I installed <code>expo</code> using <code>npm install -g expo-cli</code> but <code>expo start</code> gave me: </p>
  
  <p><code>'expo' is not recognized as an internal or external command,
  operable program or batch file.</code></p>
  
  <p>I checked my error file and this is what it says: </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   'start' ]
  2 info using npm@6.4.1
  3 info using node@v10.14.2
  4 verbose run-script [ 'prestart', 'start', 'poststart' ]
  5 info lifecycle @~prestart: @
  6 info lifecycle @~start: @
  7 verbose lifecycle @~start: unsafe-perm in lifecycle true
  8 verbose lifecycle @~start: PATH: C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;C:\Users\Linda\Documents\U of T Engineering\2018\Jobs\IoT for Education\alarmApp\node_modules\.bin;C:\Python27\;C:\Python27\Scripts;C:\ProgramData\Boxstarter;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\TDM-GCC-64\bin;C:\Program Files\Git\cmd;C:\Python3;C:\Python3\Scripts;C:\Program Files\PuTTY\;C:\Program Files\MATLAB\R2017b\bin;C:\Go\bin;C:\WINDOWS\System32\OpenSSH\;C:\ProgramData\chocolatey\bin;C:\xampp\php;C:\ProgramData\ComposerSetup\bin;C:\Program Files\nodejs\;C:\Users\Linda\AppData\Local\Programs\Python\Python36-32\Scripts\;C:\Users\Linda\AppData\Local\Programs\Python\Python36-32\;C:\Users\Linda\AppData\Local\Microsoft\WindowsApps;C:\Users\Linda\AppData\Local\atom\bin;C:\altera_lite\16.0\modelsim_ase\win32aloem;C:\Users\Linda\AppData\Local\Microsoft\WindowsApps;C:\Users\Linda\go\bin;C:\Program Files\Docker Toolbox;;C:\Program Files\Docker Toolbox;C:\Program Files\Docker Toolbox;C:\Users\Linda\AppData\Roaming\Composer\vendor\bin;C:\Users\Linda\AppData\Roaming\npm
  9 verbose lifecycle @~start: CWD: C:\Users\Linda\Documents\U of T Engineering\2018\Jobs\IoT for Education\alarmApp
  10 silly lifecycle @~start: Args: [ '/d /s /c', 'expo start' ]
  11 silly lifecycle @~start: Returned: code: 1  signal: null
  12 info lifecycle @~start: Failed to exec start script
  13 verbose stack Error: @ start: `expo start`
  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:301:16)
  13 verbose stack     at EventEmitter.emit (events.js:182:13)
  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 ChildProcess.emit (events.js:182:13)
  13 verbose stack     at maybeClose (internal/child_process.js:962:16)
  13 verbose stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:251:5)
  14 verbose pkgid @
  15 verbose cwd C:\Users\Linda\Documents\U of T Engineering\2018\Jobs\IoT for Education\alarmApp
  16 verbose Windows_NT 10.0.17134
  17 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "start"
  18 verbose node v10.14.2
  19 verbose npm  v6.4.1
  20 error code ELIFECYCLE
  21 error errno 1
  22 error @ start: `expo start`
  22 error Exit status 1
  23 error Failed at the @ start 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 have no idea why expo stopped working and what the error file means. Please help! Thanks.</p>