Warning: require_once(vendor/autoload.php): Failed to open stream: No such file or directory in /srv/www/webserver.scriptlink.com/sendpage copy.php on line 35

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php') in /srv/www/webserver.scriptlink.com/sendpage copy.php:35 Stack trace: #0 {main} thrown in /srv/www/webserver.scriptlink.com/sendpage copy.php on line 35