WP Super Cache Warning and Theme Fatal Error

Good afternoon!
Please help us fix errors (warning, fatal error) on a wordpress site that appeared after updating plugins and themes.
The issue is urgent, I would like to solve the problem as soon as possible, because it is necessary to restore the site.

Errors are displayed on the site page:

Warning: include_once(/var/www/u0994668/data/www/adelhotel.ru/wp-content/plugins/wp-super-cache1/wp-cache-phase1.php): failed to open stream: No such file or directory in /var/www/u0994668/data/www/adelhotel.ru/wp-content/advanced-cache.php on line 22

Warning: include_once(): Failed opening ‘/var/www/u0994668/data/www/adelhotel.ru/wp-content/plugins/wp-super-cache1/wp-cache-phase1.php’ for inclusion (include_path=’.:’) in /var/www/u0994668/data/www/adelhotel.ru/wp-content/advanced-cache.php on line 22

Fatal error: Uncaught Error: Call to undefined function easyreservations_load_resources() in /var/www/u0994668/data/www/adelhotel.ru/wp-content/themes/hoteliour/ait-theme/includes/easy-reservations.php:72 Stack trace: #0 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/class-wp-hook.php(287): ait_easyreservations_register_scripts(”) #1 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #2 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #3 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/script-loader.php(2294): do_action(‘wp_enqueue_scri…’) #4 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/class-wp-hook.php(287): wp_enqueue_scripts(”) #5 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #6 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #7 /var/www/u0994668/data/www/adelhotel.ru/wp-includes/gen in /var/www/u0994668/data/www/adelhotel.ru/wp-content/themes/hoteliour/ait-theme/includes/easy-reservations.php on line 72

Warning: Cannot modify header information – headers already sent by (output started at /var/www/u0994668/data/www/adelhotel.ru/wp-content/advanced-cache.php:22) in /var/www/u0994668/data/www/adelhotel.ru/wp-includes/functions.php on line 6221

Warning: Cannot modify header information – headers already sent by (output started at /var/www/u0994668/data/www/adelhotel.ru/wp-content/advanced-cache.php:22) in /var/www/u0994668/data/www/adelhotel.ru/wp-admin/includes/misc.php on line 1259

Warning: Cannot modify header information – headers already sent by (output started at /var/www/u0994668/data/www/adelhotel.ru/wp-content/advanced-cache.php:22) in /var/www/u0994668/data/www/adelhotel.ru/wp-admin/admin-header.php on line 9

Please tell us where and what you need to fix to fix this problem. I will be very grateful for your help!