Answers.Body: <p>Try reinstalling Craft. I believe there was another report from a user that had similar JS errors. Try replacing the core Craft files in <code>craft/app</code> and see if that helps.</p>
  
  <p>Craft 2.7.1 was also recently released.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-08-28T01:07:37.383Z
Answers.Text: Probably worth trying to just clear out `craft/storage/runtime/cache` folder, too.
Answers.UserDisplayName: Brad Bell
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2018-08-25T12:25:39.570Z
Answers.LastActivityDate: 2018-08-25T12:25:39.570Z
Answers.UserDisplayName: James White
Body: <p>My Control Panel has stopped working since upgrading to Craft v2.7.0. in chrome. I get the following JS error no matter what is clicked in the entry fields and no action is taken. So for example if I want to remove and image and click the minus button nothing happens. If I try and add Matrix fields nothing happens. All of these were working prior to the update.</p>
  
  <blockquote>
    <p>Uncaught TypeError: Cannot read property 'length' of null
        at n.constructor.getWorkingTaskInfo (cp.js:863)
        at n.constructor.setTaskInfo (cp.js:832)</p>
  </blockquote>
  
  <p>I'm running on PHP 7.0.13 any ideas?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-08-25T10:47:57.420Z
Comments.Text: Also just checked it on firefox same issue.
Comments.UserDisplayName: Lettie
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-08-26T12:51:11.150Z
Comments.Text: Tried upgrading to v 2.7.2 and still throwing errors.
Comments.UserDisplayName: Lettie
Tags: <control-panel><upgrades><craft2>
Title: Craft 2 JS error in CMS since upgrade to 2.7.0
ThreadText: # Craft 2 JS error in CMS since upgrade to 2.7.0
  
  (Asked by: username_0 on 2018-08-25)
  
  My Control Panel has stopped working since upgrading to Craft v2.7.0. in chrome. I get the following JS error no matter what is clicked in the entry fields and no action is taken. So for example if I want to remove and image and click the minus button nothing happens. If I try and add Matrix fields nothing happens. All of these were working prior to the update.
  
  > Uncaught TypeError: Cannot read property 'length' of null
  > at n.constructor.getWorkingTaskInfo (cp.js:863)
  > at n.constructor.setTaskInfo (cp.js:832)
  
  I'm running on PHP 7.0.13 any ideas?
  
  **Tags:** control-panel, upgrades, craft2
  
  > **Comments:**
  > **username_0**: Also just checked it on firefox same issue.  
  > **username_0**: Tried upgrading to v 2.7.2 and still throwing errors.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2018-08-25. Score: 1 | Accepted answer
  
  Try reinstalling Craft. I believe there was another report from a user that had similar JS errors. Try replacing the core Craft files in `craft/app` and see if that helps.
  
  Craft 2.7.1 was also recently released.
  
  > **Comments:**
  > **username_2**: Probably worth trying to just clear out `craft/storage/runtime/cache` folder, too.  
  
  ---
  
  