title: I can´t run an IONIC 3 project. Always same error
body: <p>This IONIC project is not mine and it is IONIC 3 so I'm little lost so I appreciate any clue. 
  I've been stuck in this for two days.</p>
  
  <p>We have no contact with the one who developed the project for us and we wanted to take advantage of it to start programming using IONIC. Until now we used only cordova.
  But first we need to start this project.
  The same error is obtained if we try to boot on the BROWSER or ANDROID platform</p>
  
  <p>IONIC error when execute in my IONIC project (for run in the browser):</p>
  
  <pre><code>ionic server
  
  
  
      Cannot find module "@app/env"
      at Object.521 (http://localhost:8100/build/main.js:6800:7)
      at __webpack_require__ (http://localhost:8100/build/vendor.js:55:30)
      at Object.471 (http://localhost:8100/build/main.js:6492:74)
      at __webpack_require__ (http://localhost:8100/build/vendor.js:55:30)
      at Object.466 (http://localhost:8100/build/main.js:6454:70)
      at __webpack_require__ (http://localhost:8100/build/vendor.js:55:30)
      at webpackJsonpCallback (http://localhost:8100/build/vendor.js:26:23)
      at http://localhost:8100/build/main.js:1:1
  </code></pre>
  
  <p>Data about my IONIC proyect </p>
  
  <pre><code>Ionic Framework: 3.9.2
  Ionic App Scripts: 3.1.10
  Angular Core: 4.4.3
  Angular Compiler CLI: 4.4.3
  Node: 8.11.1
  OS Platform: Windows 10
  Navigator Platform: Win32
  User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36
  </code></pre>
  
  <p><strong>UPDATE MORE INFO ABOUT PROJECT:</strong></p>
  
  <p>if I run this CLI : </p>
  
  <blockquote>
    <p>ionic doctor list</p>
  </blockquote>
  
  <p><strong>This is the output:</strong></p>
  
  <p>automatic-updates-off
  npm-installed-locally
  ionic-installed-locally
  git-not-used
  git-config-invalid
  ionic-angular-update-available
  ionic-angular-major-update-available
  app-scripts-update-available
  app-scripts-major-update-available
  ionic-native-old-version-installed
  ionic-native-update-available
  ionic-native-major-update-available
  unsaved-cordova-platforms
  cordova-platforms-committed
  default-cordova-bundle-id-used
  viewport-fit-not-set</p>
  
  <p>Do you think I must run?</p>
  
  <blockquote>
    <p>ionic doctor check</p>
  </blockquote>
  
  <p><strong>This is link to package.json:</strong></p>
  
  <p><a href="https://drive.google.com/open?id=1s3VzCgoFB3JQorIwkuF6pN-olImwCDc_" rel="nofollow noreferrer">enter link description here</a></p>
  
  <p><a href="https://i.stack.imgur.com/L6Rvx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/L6Rvx.png" alt="enter image description here"></a></p>