Our gantry5 based themes are not ready for Joomla 4 at the moment, please stay with J3.10 at the moment, we are working to update our themes for J4 as soon as possible.
“500 behavior::caption not found”
This issue caused by html override that not compatible with J4, if you still want to test the theme with J4, please temporary remove the html folder at theme_root/html
Thanks
