Critical WordPress Error after Installation/Theme Activation

Hi,

i get a critical error after installing the orizon theme. Only switching back to another theme helps. This is what I get from wordpress mailer:

WordPress-Version 6.1.1
Aktives Theme: Orizon (Version 4.4)
Aktuelles Plugin: (Version )
PHP-Version 8.0.25

Error-Details
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Ein Fehler vom Typ E_ERROR wurde in der Zeile 195 der Datei /customers/9/f/2/fake.de/httpd.www/wp-content/themes/orizon/widgets/rating/popular-widget.php verursacht. Fehlermeldung: Uncaught Error: Call to undefined function create_function() in /customers/9/f/2/fake.de/httpd.www/wp-content/themes/orizon/widgets/rating/popular-widget.php:195
Stack trace:
#0 /customers/9/f/2/fake.de/httpd.www/wp-content/themes/orizon/functions.php(9): require_once()
#1 /customers/9/f/2/fake.de/httpd.www/wp-settings.php(585): include(‘/customers/9/f/…’)
#2 /customers/9/f/2/fake.de/httpd.www/wp-config.php(116): require_once(‘/customers/9/f/…’)
#3 /customers/9/f/2/fake.de/httpd.www/wp-load.php(50): require_once(‘/customers/9/f/…’)
#4 /customers/9/f/2/fake.de/httpd.www/wp-admin/admin.php(34): require_once(‘/customers/9/f/…’)
#5 /customers/9/f/2/fake.de/httpd.www/wp-admin/themes.php(10): require_once(‘/customers/9/f/…’)
#6 {main}
thrown