title: Task 'assemble' not found in root project 'flutter_project'
body: <p>I used android studio to import flutter project.I fixed some bugs but the <code>run</code> button is still disabled as in the image below.
  <a href="https://i.stack.imgur.com/yS5ns.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p>when i clicked the <code>Make Project</code> button , i get this error message </p>
  
  <blockquote>
    <p>Task 'assemble' not found in root project '<strong>flutter_project_name</strong>'.  </p>
  </blockquote>
  
  <p>i know this issue is solved her in android projects but,</p>
  
  <hr>
  
  <p>How to solve it in flutter project ?</p>
  
  <hr>
  
  <p>and Does this error is the reason why <code>run</code> button is disabled?</p>
  
  <hr>
  
  <h2>edit:</h2>
  
  <p>the exception is not related to the button disable issue. 
  the <code>run</code> button problem is solved by creating flutter run configuration </p>
  
  <ul>
  <li>click on <code>Edit Configuration</code></li>
  <li>click the <code>plus</code> icon.</li>
  <li>select <code>flutter</code></li>
  </ul>
  
  <p><strong>note :</strong> the exception does not prevent the project from running.</p>