title: react-router-dom@4.0.0 requires a peer of react@^15 but none is installed. You must install peer dependencies yourself
body: <p>I have installed all required libraries using <code>npm install</code> and I also done <code>npm install --save react-router-dom@4.0.0</code> but I am still getting this error. </p>
  
  <p>My Package.json</p>
  
  <pre><code>  "author": "",
    "license": "ISC",
    "devDependencies": {
      "babel-core": "^6.2.1",
      "babel-loader": "^6.2.0",
      "babel-preset-es2015": "^6.1.18",
      "babel-preset-react": "^6.1.18",
      "chai": "^3.5.0",
      "chai-jquery": "^2.0.0",
      "jquery": "^2.2.1",
      "jsdom": "^8.1.0",
      "mocha": "^2.4.5",
      "react-addons-test-utils": "^0.14.7",
      "webpack": "^1.12.9",
      "webpack-dev-server": "^1.14.0"
    },
    "dependencies": {
      "babel-preset-stage-1": "^6.1.18",
      "lodash": "^3.10.1",
      "react": "^15.6.2",
      "react-dom": "^0.14.3",
      "react-redux": "4.3.0",
      "react-router": "^2.0.1",
      "react-router-dom": "^4.0.0",
      "redux": "^3.0.4"
    }
  </code></pre>
  
  <p>After updating react, redux, react-redux,and all I got no warnings but got following error after I ran <code>npm start</code></p>
  
  <pre><code>&gt; node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js
  
  events.js:160
        throw er; // Unhandled 'error' event
        ^
  
  Error: listen EADDRINUSE 127.0.0.1:8080
      at Object.exports._errnoException (util.js:1020:11)
      at exports._exceptionWithHostPort (util.js:1043:20)
      at Server._listen2 (net.js:1258:14)
      at listen (net.js:1294:10)
      at net.js:1404:9
      at GetAddrInfoReqWrap.asyncCallback [as callback] (dns.js:62:16)
      at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:81:10)
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! redux-simple-starter@1.0.0 start: `node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the redux-simple-starter@1.0.0 start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /Users/myhome/.npm/_logs/2017-12-23T00_38_08_579Z-debug.log
  </code></pre>