Images cannot be uploaded

PHP Version 8.1.10
Wordpress Version 6.0.2

Cannot upload images to rooms.
Rooms -> Rooms List -> Add New -> (Room Main Image, Extra Images) give this error:

Fatal error: Uncaught Error: Call to undefined function imagetypes() in C:\xampp\htdocs\wordpress\wp-content\plugins\vikbooking\admin\controller.php:1046 Stack trace: #0 C:\xampp\htdocs\wordpress\wp-content\plugins\vikbooking\admin\controller.php(868): VikBookingController->do_createroom() #1 C:\xampp\htdocs\wordpress\wp-content\plugins\vikbooking\libraries\adapter\mvc\controller.php(323): VikBookingController->createroom() #2 C:\xampp\htdocs\wordpress\wp-content\plugins\vikbooking\libraries\system\body.php(55): JController->execute('createroom') #3 C:\xampp\htdocs\wordpress\wp-content\plugins\vikbooking\vikbooking.php(199): VikBookingBody::process() #4 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(307): {closure}('') #5 C:\xampp\htdocs\wordpress\wp-includes\class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #6 C:\xampp\htdocs\wordpress\wp-includes\plugin.php(476): WP_Hook->do_action(Array) #7 C:\xampp\htdocs\wordpress\wp-settings.php(598): do_action('init') #8 C:\xampp\htdocs\wordpress\wp-config.php(96): require_once('C:\\xampp\\htdocs...') #9 C:\xampp\htdocs\wordpress\wp-load.php(50): require_once('C:\\xampp\\htdocs...') #10 C:\xampp\htdocs\wordpress\wp-admin\admin.php(34): require_once('C:\\xampp\\htdocs...') #11 {main} thrown in C:\xampp\htdocs\wordpress\wp-content\plugins\vikbooking\admin\controller.php on line 1046