Warning: require_once(database.php): Failed to open stream: No such file or directory in /var/www/html/classes/PremiumTierManager.php on line 8

Fatal error: Uncaught Error: Failed opening required 'database.php' (include_path='.:/usr/local/lib/php') in /var/www/html/classes/PremiumTierManager.php:8 Stack trace: #0 /var/www/html/api/subscriptions.php(10): require_once() #1 {main} thrown in /var/www/html/classes/PremiumTierManager.php on line 8