title: I opened an Existing flutter app in android studio but it shows error
body: <p>I opened an existing flutter app in android studio but 2 errors appearing in the AS</p>
  
  <p>1st error is <strong>DART SDK IS NOT CONFIGURED</strong></p>
  
  <p>2nd error is <strong>NO DEVICE</strong> </p>
  
  <p><a href="https://i.stack.imgur.com/n2Xtw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/n2Xtw.png" alt="enter image description here"></a></p>