title: Android studio error This support library should not use a lower version (19)
body: <p>I created the project then error message:</p>
  
  <pre><code>Error:(23, 12) This support library should not use a lower version (19) than the targetSdkVersion (20)
  </code></pre>
  
  <p>error code is here: <code>compile 'com.android.support:appcompat-v7:19.+'</code></p>