PHP 8.0 / 8.1 Fatal Errors

Hi there,

plugin produces fatal error when upgrading site to PHP 8.0/8.1 .. Any ideas?

Fatal error: Uncaught Error: Call to undefined function create_function() in /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-content/plugins/wpdevart-countdown-pro/includes/widget.php:536 Stack trace: #0 /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-content/plugins/wpdevart-countdown-pro/wpdevart-countdown.php(53): require_once() #1 /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-content/plugins/wpdevart-countdown-pro/wpdevart-countdown.php(36): wpdevart_countdown_main->wpdevart_countdown_front_end() #2 /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-content/plugins/wpdevart-countdown-pro/wpdevart-countdown.php(91): wpdevart_countdown_main->__construct() #3 /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-settings.php(447): include_once(‘/homepages/41/d…’) #4 /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-config.php(98): require_once(‘/homepages/41/d…’) #5 /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-load.php(50): require_once(‘/homepages/41/d…’) #6 /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-blog-header.php(13): require_once(‘/homepages/41/d…’) #7 /homepages/41/d241638650/htdocs/kerb/index.php(17): require(‘/homepages/41/d…’) #8 {main} thrown in /homepages/41/d241638650/htdocs/kerb/lisbeth/wp-content/plugins/wpdevart-countdown-pro/includes/widget.php on line 536

Deprecated: Directive ‘allow_url_include’ is deprecated in Unknown on line 0