title: Twitter Log In Button Greyed Out
body: <p>I'm trying to implement logging in with twitter in my app. I just came across news that states that Fabric was sold to Google. I am not using Fabric in my application. Instead I am using the twitter core sdk <code>com.twitter.sdk.android:twitter-core:3.1.1</code> . I try to initialise Twitter but the login button is still greyed out with this code:<br><br></p>
  
  <pre><code>TwitterConfig config = new TwitterConfig.Builder(this)
                  .logger(new DefaultLogger(Log.DEBUG))
                  .twitterAuthConfig(new TwitterAuthConfig(getString(R.string.twitter_key), getString(R.string.twitter_secret)))
                  .debug(true)
                  .build();
          Twitter.initialize(config);
  </code></pre>
  
  <p><br>I see the following error output in my logcat<br><code>E/Twitter: Must initialize Twitter before using getInstance()</code><br><br>
  How can I go about this error?</p>