After upgrading to 3.8.4 today, I got this error:

Fatal error: Cannot declare class JText, because the name is already in use in [....]/components/com_sef/helpers/methods.php on line 104

After renaming JText to something else, it worked fine.

I believe you have seen this already, anyways.

-rsd

We get this error on our site with Joomsef 4.7.1:
Fatal error: Call to undefined method JText::getScriptStrings() in /libraries/src/Document/HtmlDocument.php on line 148

Disabling system plugin "System - ARTIO JoomSEF" removes it, but sef doesn't work then.

What to do :(

rkriver wrote:

same here but depends on the template too. Old yootheme_nano_2 throws out that error while T3 blank from joomlart is working fine.

as a temp fix I reverted it back to
$data['scriptText'] = \JText::script();

github.com/joomla/joomla-cms/commit/0531...039de7e125ee3c4658ba

same problem for me. After Upgrading to Joomla 3.8.4 it says Fatal error: Call to undefined method JText::getScriptStrings().
I think it belongs to /components/com_sef/helpers/methods.php. Here you can find the class JText. When I rename this class, the error dissapears. I dont think this is the solution, but maybe a good hint for the developers?

I hope Artio-Team has an answer for this issue?

Best regards
Dirk

t hink the class JText in /components/com_sef/helpers/methods.php just misses the getScriptStrings() function.
Hope for an update soon.