I need your help

corporex_helix3 - Default does not work anymore suddenly i have not done anything to the template

I can help me quickly

addendum

the last backup works again.

but it is because of the update from System - Helix3 Framework 257 to 258

when i update and save a text in the page builder, then the homepage is blank in the fontend.

also another page is now affected.

as error message comes

Warning: require_once(/hp/cc/ad/bk/www/libraries/joomla/document/html/renderer/head.php): failed to open stream: No such file or directory in /hp/cc/ad/bk/www/templates/corporex_helix3/error.php on line 38

Fataler Fehler: require_once(): Failed opening required '/hp/cc/ad/bk/www/libraries/joomla/document/html/renderer/head.php' (include_path='.:/opt/php7.4.11/lib/php') in /hp/cc/ad/bk/www/templates/corporex_helix3/error.php on line 38