title: Can't load Kernel binary: Invalid kernel binary format version. No active package webdev
body: <p>After running <code>webdev serve</code> it gives "Can't load Kernel binary: Invalid kernel binary format version.
  No active package webdev."
  this error</p>
  
  <p>tried this and it added some dependencies </p>
  
  <pre><code>flutter packages pub global activate webdev
  </code></pre>