title: Error with JQUERY in Multimedia Library of Wordpress
body: <p><img src="https://i.stack.imgur.com/meq20.png" alt="enter image description here">
  With the latest version of Wordpress I can't upload media. It shows this message from debugger:</p>
  
  <pre><code>Uncaught Error: Syntax error, unrecognized expression: a[rel=] load-scripts.php?c=1&amp;load[]=jquery-core,jquery-migrate,utils,plupload,jquery-ui-core&amp;ver=4.2.2:2 Uncaught Error: Syntax error, unrecognized expression: a[rel=]
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/5xjFJ.png" alt="It doesn&#39;t show any item and when I try to upload a photo, it keeps the same screen"></p>
  
  <p>It seems to be a jQuery problem, I tried to re-upload again files from wp-includes and upload.php, but it didn't work.</p>
  
  <p>It is important not to downgrade for our project, how can I solve that?</p>
  
  <p>UPDATE: Key error to solve (not the a[rel=] one)
  <img src="https://i.stack.imgur.com/FB8As.png" alt="enter image description here"></p>
  
  <p>UPDATE 2: It still fails at uploading, but it only has now the a[rel=] error
  <img src="https://i.stack.imgur.com/blhst.png" alt="enter image description here"></p>