Warning: require(vendor/autoload.php): Failed to open stream: No such file or directory in /home/httpd/vhosts/plc.sbw.media/domains/anmeldung.sbw.media/mail_functions.php on line 9

Warning: require(vendor/autoload.php): Failed to open stream: No such file or directory in /home/httpd/vhosts/plc.sbw.media/domains/anmeldung.sbw.media/mail_functions.php on line 9

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/pear:/usr/share/php') in /home/httpd/vhosts/plc.sbw.media/domains/anmeldung.sbw.media/mail_functions.php:9
Stack trace:
#0 /home/httpd/vhosts/plc.sbw.media/domains/anmeldung.sbw.media/index.php(4): require_once()
#1 {main}
  thrown in /home/httpd/vhosts/plc.sbw.media/domains/anmeldung.sbw.media/mail_functions.php on line 9