Warning: include_once(/var/www/html/wp-admin/includes/plugin.php): failed to open stream: No such file or directory in /var/www/html/wp-content/plugins/stops-core-theme-and-plugin-updates/includes/MPSUM_Utils.php on line 227

Warning: include_once(): Failed opening '/var/www/html/wp-admin/includes/plugin.php' for inclusion (include_path='.:/usr/local/lib/php') in /var/www/html/wp-content/plugins/stops-core-theme-and-plugin-updates/includes/MPSUM_Utils.php on line 227

Fatal error: Uncaught Error: Call to undefined function get_plugins() in /var/www/html/wp-content/plugins/stops-core-theme-and-plugin-updates/includes/MPSUM_Utils.php:228
Stack trace:
#0 /var/www/html/wp-content/plugins/stops-core-theme-and-plugin-updates/main.php(553): MPSUM_Utils->maybe_deactivate_free_version()
#1 /var/www/html/wp-content/plugins/stops-core-theme-and-plugin-updates/main.php(537): MPSUM_Updates_Manager->check_premium()
#2 /var/www/html/wp-includes/class-wp-hook.php(324): MPSUM_Updates_Manager->plugins_loaded('')
#3 /var/www/html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#4 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#5 /var/www/html/wp-settings.php(506): do_action('plugins_loaded')
#6 /var/www/html/wp-config.php(94): require_once('/var/www/html/w...')
#7 /var/www/html/wp-load.php(50): require_once('/var/www/html/w...')
#8 /var/www/html/wp-blog-header.php(13): require_once('/var/www/html/w...')
#9 /var/www/html/index.php(17): require('/var/www/html/w in /var/www/html/wp-content/plugins/stops-core-theme-and-plugin-updates/includes/MPSUM_Utils.php on line 228