Warning: require_once(vendor/autoload.php): Failed to open stream: No such file or directory in /home/appointment/Controller/databasetool.php on line 8

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php') in /home/appointment/Controller/databasetool.php:8 Stack trace: #0 /home/appointment/Controller/dashboard_controller.php(6): include_once() #1 {main} thrown in /home/appointment/Controller/databasetool.php on line 8