title: React-native install issue in expo app
body: <p>I'm trying to learn react-native by creating an app using the expo development environment. I had a working app (little more than the code that shipped with expo) until installing redux. Currently I am getting the following error from the XDE:</p>
  
  <pre><code>Problem checking node_modules dependencies: Unexpected end of JSON input
  </code></pre>
  
  <p>and the following from the ios simulator:</p>
  
  <pre><code>undefined is not an object (evaluating 'ReactPropTypes.string')
  </code></pre>
  
  <p>Package.json:</p>
  
  <pre><code>{
    "name": "myApp",
    "version": "0.0.0",
    "description": "Hello Expo!",
    "author": null,
    "main": "main.js",
    "scripts": {
      "test": "node node_modules/jest/bin/jest.js"
    },
    "jest": {
      "preset": "jest-expo"
    },
    "dependencies": {
      "@expo/ex-navigation": "~3.0.0",
      "@expo/samples": "~1.0.3",
      "babel-preset-react": "^6.24.1",
      "expo": "17.0.0",
      "react": "^16.0.0-alpha.12",
      "react-native": "^0.45.1",
      "react-redux": "^5.0.5",
      "redux": "^3.6.0"
    },
    "devDependencies": {
      "jest-expo": "~1.0.1"
    }
  }
  </code></pre>
  
  <p>I believe my node modules contain valid JSON. It should be noted that I'm using a more current version of react-native than expo. Is this an issue with the packages I have installed? Which files would be helpful in solving this?</p>