title: Android Studio fails to resolve repository
body: <p>In my project, I'm trying to use the design support library.  I have in my Gradle file:</p>
  
  <pre><code>dependencies {
      ....
      compile 'com.android.support:design'
      ....
  }
  </code></pre>
  
  <p>And when I try to build this, I get the error:</p>
  
  <p><a href="https://i.stack.imgur.com/d0PK6.png" rel="noreferrer"><img src="https://i.stack.imgur.com/d0PK6.png" alt="enter image description here"></a></p>
  
  <p>Normally I would just click <em><code>Install Repository and sync project</code></em>, however, this seems to <em>not work anymore</em>.  Clicking this does absolutely nothing, even though clicking <code>Open File</code> works fine.  </p>
  
  <p><strong>How can I manually install it?</strong></p>
  
  <p>I have the latest Android Support Repository (30.0.0), and Android Support Library (23.2.1) installed.</p>