Full Frame Pro technical problem E_COMPILE_ERROR

Hi I have two websites built on Full Frame Pro. Both sites are not working anymore and I got the below message from WordPress. I assume the issue is with the Theme. I have to admit that I haven’t updated anything in the passed years. I see however, that I am running the latest version of Full Frame Pro.   Any help resolving the problem is very much appreciated. Thanks   Email form WordPress:   Wenn du Hilfe bei diesem Problem suchst, wirst du möglicherweise nach einigen der folgenden Informationen gefragt: WordPress-Version 5.9 Aktives Theme: Full Frame Pro Child Theme (Version 1.0) Aktuelles Plugin: (Version ) PHP-Version 7.3.26 Fehler-Details ============== Ein Fehler vom Typ E_COMPILE_ERROR wurde in der Zeile 24 der Datei /var/www/web79/html/wp-pilatech/wp-content/themes/full-frame-pro/functions.php verursacht. Fehlermeldung: require(): Failed opening required '/var/www/web79/html/wp-pilatech/wp-content/themes/full-frame-pro/inc/fullframe-core.php' (include_path='.:/usr/local/php7.3/lib/php')