Warning: require_once(Database.php): Failed to open stream: No such file or directory in /var/www/html/application/views/admin/config.php on line 21

Fatal error: Uncaught Error: Failed opening required 'Database.php' (include_path='.:/usr/share/pear:/usr/share/php:/usr/share/pear:/usr/share/php') in /var/www/html/application/views/admin/config.php:21 Stack trace: #0 {main} thrown in /var/www/html/application/views/admin/config.php on line 21