Error: 0 Call to undefined method JAdminCssMenu::addChild()

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I've got 2.9.7. Is that not the latest?

Glad to have found this thread. Despite the assertions to the contrary, I still needed the advice here (disable vData then upgrade) to allow me to upgrade to 3.8.

I already restored the site to an earlier version, uninstalled your program and upgraded Joomla to 3.8 - problem solved.

I have the same issue, cant find the file you talk about, please help!! We have a News Agency that has no BACKEND ACCCESS NOW!!!!

After installing the mod_data_admin_menu module, only the top toolbar is displayed. Viewing the pages source code, "Error: 0 Call to undefined method JAdminCssMenu::addChild()" is shown as the issue.

I believe this is due to the fact that there is a conflict between com_menu and mod_data_admin_menu. the both have the same JAdminCssMenu class name.

To resolve this issue, I renamed the JAdminCssMenu class in mod_data_admin_menu to JVdataAdminCssMenu. I also change reference to JAdminCssMenu in the mod_vdata_admin_menu.php file to use the new class name.

Maybe use namespaces in the future?

Thanks, Scott