title: Error when run Android studio IDE
body: <p>When I launch Android studio I encounter this Error:  </p>
  
  <p><img src="https://i.stack.imgur.com/9qY5U.png" alt="enter image description here">  </p>
  
  <pre><code>    The following SDK components were not installed: build-tools-21.1.1, source-21, sys-img-x86-addon-google_apis-google-21, 
      extra-android-m2repository, android-21, extra-google-m2repository, addon-google_apis-google-21, tools, platform-tools
  </code></pre>
  
  <p>And when I click retry, it gives me the same error:  </p>
  
  <p><img src="https://i.stack.imgur.com/oom1T.png" alt="enter image description here"></p>