today updated Joomla 3.7.5 on 3.8.0 & I have error: "Error displaying the error page: Call to undefined method JAdminCssMenu::addChild(): Call to undefined method JAdminCssMenu::addChild()"

Joomla admin panel doesn't work with sections. Can you help me please.

Thanks a lot.

Best regards, Alex K.

Problem solved. Please, your folders (backup) on local disk (for example: C or D or E disk) upload folders on your FTP. And your admin panel again work last Joomla ver. 3.7.x

Upload on FTP

Alex K

  • i am having the same problem. Can i ask you how did you solve it? Kind regards Saviour
    – Saviour
    Sep 20, 2017 at 10:44
  • I change the folders in the administrator folder. Please careful about your components. I don't have a special configuration as SP Page Builder.
    – R. Mittl
    Sep 21, 2017 at 6:49
  • Dear Saviour, Before Joomla 3.8.0 upgrade - in: Admin panel -> Extension -> Manager extension -> Control -> Configure the filter on the Control Panel !!! -> & please TURN OFF "SP Page Builder Admin Menu"! And everything will work. Now you can upgrade to Joomla 3.8.0.
    – Alex K
    Sep 22, 2017 at 20:13
  • More specifically, does anyone know the CAUSE of this change? I have the same error from a different extension, so cannot just download a patch. In my case, the line that throws the error is $menu->addChild(new JMenuNode(JText::_('REDACTED'), '#'), true);
    – mike
    Sep 29, 2017 at 20:13

1 Answer 1


This is a known issue but isn't related to Joomla.

Other people have also ran into the same error, and it's due to SP Page Builder Pro

More information can be found on it here: https://www.joomshaper.com/forums/joomla-3-8

Solution: Update SP Page Builder Pro to 2.5.3

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