Plesk Error

I am working on a server with Plesk panel and when I go try to go to WP Opcache, I just get a server error.

2791529#0: *9839368 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Call to undefined function opcache_get_status() in /var/www/vhosts/awts.com/httpdocs/wp-content/plugins/flush-opcache/admin/class-flush-opcache-admin.php:93
Stack trace:
#0 /var/www/vhosts/awts.com/httpdocs/wp-includes/class-wp-hook.php(324): Flush_Opcache_Admin->flush_opcache_admin_page()
#1 /var/www/vhosts/awts.com/httpdocs/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#2 /var/www/vhosts/awts.com/httpdocs/wp-includes/plugin.php(517): WP_Hook->do_action()
#3 /var/www/vhosts/awts.com/httpdocs/wp-admin/admin.php(260): do_action()
#4 /var/www/vhosts/awts.com/httpdocs/wp-admin/tools.php(40): require_once('...')
#5 {main}
thrown in /var/www/vhosts/awts.com/httpdocs/wp-content/plugins/flush-opcache/admin/class-flush-opcache-admin.php on line 93" while reading response header from upstream

Here are the opcache settings: