title: Checking dart sdk version
body: <p>I just run the flutter command <code>flutter upgrade</code> in my project. And after that I am facing this error all the time.</p>
  <p><a href="https://i.stack.imgur.com/tlLSR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tlLSR.png" alt="enter image description here" /></a></p>