Thank you for your time and sorry for taking your time.
I appreciate your reply.
In the WordPress email is just specified an error has been occur from your plugin.
I looked into WordPress error log and found:
PHP Fatal error: Uncaught Error: Call to undefined function opcache_get_status() in /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php:3029
#0 /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php(824): SWCFPC_Cache_Controller->purge_opcache()
#1 /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php(2349): SWCFPC_Cache_Controller->purge_urls()
#2 /wp-includes/class-wp-hook.php(324): SWCFPC_Cache_Controller->ajax_purge_single_post_cache()
#3 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#4 /wp-includes/plugin.php(517): WP_Hook->do_action()
#5 /wp-admin/admin-ajax.php(192): do_action()
#6 {main}
thrown in /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php on line 3029
#0 /wp-content/plugins/wp-cloudflare-page-cache/libs/cache_controller.class.php(730): SWCFPC_Cache_Controller->purge_opcache()
#1 /wp-content/plugins/wp-cloudflare-page-cache/src/Modules/Settings_Manager.php(175): SWCFPC_Cache_Controller->purge_all()
#2 /wp-includes/class-wp-hook.php(324): SPC\Modules\Settings_Manager->update_additional_settings()
#3 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#4 /wp-includes/plugin.php(517): WP_Hook->do_action()
#5 /wp-content/plugins/wp-cloudflare-page-cache/libs/backend.class.php(1091): do_action()
#6 /wp-includes/class-wp-hook.php(324): SWCFPC_Backend->admin_menu_page_index()
#7 /wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters()
#8 /wp-includes/plugin.php(517): WP_Hook->do_action()
#9 /wp-admin/admin.php(259): do_action()
#10 /wp-admin/options-general.php(10): require_once('...')