title: 'UI' does not exist in the namespace 'UnityEngine'
body: <p>I've tried a lot of things already but nothing worked. <a href="https://i.stack.imgur.com/3A3z4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3A3z4.png" alt="enter image description here"></a></p>
  
  <p>I've already reimported, deleted, and reinstalled stuff. I'm using unity 2019.3.0f6 and vs code 1.42.1.</p>