I am trying to login to the backend of my Joomla installation and have this error:

0 Class 'JToolbarHelper' not found

I'm not sure how to fix it.

I updated the tmp directory in the server setting to match the webhost as I was having troubles running the autoupdate and it broke the backend.

Joomla 3.8

  • 1
    Did you update to Joomla 3.9? Also can you provide the stack trace? – Lodder Oct 31 '18 at 18:12
  • You found any solution? I have the same issue! – David Marcelo Finzi Nov 12 '18 at 23:55
  • @BrianH DavidMarceloFinzi is wondering if you have managed to find a solution for this issue because he, too, is experiencing the same issue. If so, please post your resolution in an educational manner for the benefit of researchers. – mickmackusa Nov 13 '18 at 2:00
  • This may be a duplicate of the question at: joomla.stackexchange.com/q/20710/120 although there is a more recent discussion at: github.com/joomla/joomla-cms/issues/21960 - I'd be inclined to update Joomla and all third party extensions to the latest versions to see if that helps. – Neil Robertson Nov 13 '18 at 7:10

I was able to solve the issue thanks to the help from github.

Add following code to the /sitefolder/administrator/includes/helper.php:

if(!class_exists('JToolbarHelper')) {
require_once JPATH_ADMINISTRATOR . '/includes/toolbar.php';

then I update it again to the latest version.

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