title: Uncaught DOMException: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts a shadow tree
body: <p>I am using <code>webpack 4.29.6</code> version. </p>
  
  <p>here is the command I am running</p>
  
  <pre><code>webpack-dev-server --mode development --open --hot
  </code></pre>
  
  <p>I am getting two errors in console. </p>
  
  <pre><code> Uncaught DOMException: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts a shadow tree.
  at init (chrome-extension://kacljcbejojnapnmiifgckbafkojcncf/include.preload.js:442:39)
  at chrome-extension://kacljcbejojnapnmiifgckbafkojcncf/include.preload.js:589:29
  bundle.js:1 Failed to load resource: the server responded with a status of 404 (Not Found)
  
  
  
  localhost/:1 Uncaught SyntaxError: Unexpected end of JSON input
  at JSON.parse (&lt;anonymous&gt;)
  at showNeg.js:241
  at XMLHttpRequest.onDefaultReadyStateChangeHandler (showNeg.js:311) 
  </code></pre>
  
  <p>am I doing anything wrong?
  Thanks in advance</p>