title: Accidentally include ':app' line deleted in settings.gradle file i cannot sync or run project
body: <p>like I said: I accidentally deleted <code>include ':app'</code> and i clicked <code>sync</code>.</p>
  
  <p>Now i rewrote that line again, there is no <code>sync</code> button so for me: everything is lost. </p>
  
  <p>Do i have to start a new project to soleve this problem?</p>
  
  <p>Thanks in advance.</p>
  
  <p>There is <strong>no</strong> <code>Tools -&gt; Android -&gt; Sync Project with Gradle Files and Build -&gt; Rebuild Project</code></p>