title: Project file is incomplete. expected imports are missing. vs 2017
body: <p>I have updated visual studio and after update Asp Core API showing error <a href="https://i.stack.imgur.com/Hxqgd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Hxqgd.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/XBMZr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XBMZr.png" alt="enter image description here"></a></p>