title: Error running 'app': Default Activity not found
body: <p>I do find multiple solutions on here, but non of them work for me...
  I cloned an ixisting Androi project, it worked perfectly fine, I added and changed some code, added a fragment and a resource for the fragment. While doing this, everything kept working fine, but suddenly I got this error...</p>
  
  <p>I tried several things:
  1. In "Edit Configuration" changed the "Default Activity" to specific activity, but than I get the error that it is not specified in the AndroidManifest.xml (which it is).
  2. I tried using the full package path in the manifest ("com.example.something.ActivityLogin" instead of ".ActivityLogin")</p>
  
  <pre><code>    &lt;activity android:name=".ActivityLogin"
          android:launchMode="singleInstance"
          android:screenOrientation="portrait"
          android:configChanges="orientation|keyboardHidden"
          android:windowSoftInputMode="adjustResize"&gt;
  
          &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.MAIN" /&gt;
  
              &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
          &lt;/intent-filter&gt;
  
      &lt;/activity&gt;
  </code></pre>
  
  <ol start="3">
  <li>Invalidated caches and restarted</li>
  <li>Tried reinstalling Androi Studio</li>
  </ol>
  
  <p>And now for the craziest one:
  5. Removed the entire project, pulled the master from git, and the issue is still present!</p>
  
  <p>Also, I did not touch the AndroidManifest nor the ActivityLogin at all, I did not refactor anything...</p>
  
  <p>I'm not sure where to look further, I'm guessing it is an Android Studio (3.2.1 from October 9, 2018) related issue? Also, another project keeps running just fine...</p>