title: The development server returned response error code: 500 in react native
body: <p>I am using <code>react-native</code> framework for developing my android app. I want to use <code>react-native-material-design</code> library for making <code>Toolbar</code> with some more features.</p>
  
  <p>I installed this library in current directory where my project is using below command :-</p>
  
  <pre><code>E:\&gt;npm i react-native-material-design -g --save
  C:\Users\ch-e00925\AppData\Roaming\npm
  `-- react-native-material-design@0.3.7
    +-- react-native-material-design-styles@0.2.6  (git+https://github.com/react-n
  ative-material-design/react-native-material-design-styles.git#bdc029c1a1c83ff563
  d10868be38b8aed1e9989b)
    `-- react-native-vector-icons@2.1.0
      +-- lodash@4.17.4
      `-- yargs@4.8.1
        +-- cliui@3.2.0
        | +-- strip-ansi@3.0.1
        | | `-- ansi-regex@2.1.1
        | `-- wrap-ansi@2.1.0
        +-- decamelize@1.2.0
        +-- get-caller-file@1.0.2
        +-- lodash.assign@4.2.0
        +-- os-locale@1.4.0
        | `-- lcid@1.0.0
        |   `-- invert-kv@1.0.0
        +-- read-pkg-up@1.0.1
        | +-- find-up@1.1.2
        | | +-- path-exists@2.1.0
        | | `-- pinkie-promise@2.0.1
        | |   `-- pinkie@2.0.4
        | `-- read-pkg@1.1.0
        |   +-- load-json-file@1.1.0
        |   | +-- graceful-fs@4.1.11
        |   | +-- parse-json@2.2.0
        |   | | `-- error-ex@1.3.0
        |   | |   `-- is-arrayish@0.2.1
        |   | +-- pify@2.3.0
        |   | `-- strip-bom@2.0.0
        |   |   `-- is-utf8@0.2.1
        |   +-- normalize-package-data@2.3.5
        |   | +-- hosted-git-info@2.1.5
        |   | +-- is-builtin-module@1.0.0
        |   | | `-- builtin-modules@1.1.1
        |   | +-- semver@5.3.0
        |   | `-- validate-npm-package-license@3.0.1
        |   |   +-- spdx-correct@1.0.2
        |   |   | `-- spdx-license-ids@1.2.2
        |   |   `-- spdx-expression-parse@1.0.4
        |   `-- path-type@1.1.0
        +-- require-directory@2.1.1
        +-- require-main-filename@1.0.1
        +-- set-blocking@2.0.0
        +-- string-width@1.0.2
        | +-- code-point-at@1.1.0
        | `-- is-fullwidth-code-point@1.0.0
        |   `-- number-is-nan@1.0.1
        +-- which-module@1.0.0
        +-- window-size@0.2.0
        +-- y18n@3.2.1
        `-- yargs-parser@2.4.1
          `-- camelcase@3.0.0
  
  
  E:\&gt;
  </code></pre>
  
  <p>After this I am getting one issue while running a application, it is may be library was not installed successfully.</p>
  
  <pre><code>E:\Myntra&gt;react-native start
  Scanning 557 folders for symlinks in E:\Myntra\node_modules (114ms)
   ┌────────────────────────────────────────────────────────────────────────────┐
  
   │  Running packager on port 8081.                                            │
  
   │                                                                            │
  
   │  Keep this packager running while developing on any JS projects. Feel      │
  
   │  free to close this tab and run your own packager instance if you          │
  
   │  prefer.                                                                   │
  
   │                                                                            │
  
   │  https://github.com/facebook/react-native                                  │
  
   │                                                                            │
  
   └────────────────────────────────────────────────────────────────────────────┘
  
  Looking for JS files in
     E:\Myntra
  
  [01/23/2017, 13:36:07] &lt;START&gt; Initializing Packager
  [01/23/2017, 13:36:08]         HMR Server listening on /hot
  
  React packager ready.
  
  [01/23/2017, 13:36:12] &lt;START&gt; Requesting bundle
                                 bundle_url: /index.android.bundle?platform=androi
  d&amp;dev=true&amp;hot=true&amp;minify=false
  [01/23/2017, 13:36:40] &lt;START&gt; Building Haste Map
  [01/23/2017, 13:36:40] &lt;END&gt;   Building Haste Map (141ms)
  [01/23/2017, 13:36:40] &lt;END&gt;   Initializing Packager (33314ms)
  [01/23/2017, 13:36:40] &lt;START&gt; Transforming files
  transformed 584/607 (96%)(node:6316) UnhandledPromiseRejectionWarning: Unhandled
   promise rejection (rejection id: 605): UnableToResolveError: Unable to resolve
  module react-native-material-design-styles from E:\Myntra\node_modules\react-nat
  ive-material-design\lib\config.js: Module does not exist in the module map or in
   these directories:
    E:\Myntra\node_modules\react-native-material-design\node_modules
  ,   E:\Myntra\node_modules
  
  This might be related to https://github.com/facebook/react-native/issues/4968
  To resolve try the following:
    1. Clear watchman watches: `watchman watch-del-all`.
    2. Delete the `node_modules` folder: `rm -rf node_modules &amp;&amp; npm install`.
    3. Reset packager cache: `rm -fr $TMPDIR/react-*` or `npm start -- --reset-cac
  he`.
  [01/23/2017, 13:54:09] &lt;START&gt; Requesting bundle
                                 bundle_url: /index.android.bundle?platform=androi
  d&amp;dev=true&amp;hot=true&amp;minify=false
  </code></pre>
  
  <p>PS : I am on Windows 7 machine, could not find a way to execute commands. I have seen this <a href="https://stackoverflow.com/questions/40800516/the-development-server-returned-response-error-code-500-in-react-native?rq=1">The development server returned response error code: 500 in react-native</a> but it did not help me.</p>
  
  <p>Can anyone help me to resolve this issue. Thanks in advance.</p>
  
  <p><a href="https://i.stack.imgur.com/g9NCi.png" rel="noreferrer"><img src="https://i.stack.imgur.com/g9NCi.png" alt="enter image description here"></a></p>