Page Builder Issue

Hello,

I found out this error. I discovered this info thanks to Google Analytics by sending an alarm message that my all website has a technical problem with all pages… (Error server 5xx)

My website is blocked since 20 august 2021… no SEO by google, no access to mywebsite..

Fatal error: Access level to Elementor\CT_Element_Section::get_html_tag() must be protected (as in class builder\builder_Section) or weaker in /homepages/46/d844899447/htdocs/clickandbuilds/SmartLeaf/wp-content/plugins/case-theme-core/inc/page-builder/section.php on line 326
Il y a eu une erreur critique sur ce site.

My website is now damaged. Please help ASAP!

Roll back to the previous version doesn’t work!

I need real help by phone with an expert developer, please!
Kind Regards