WARNING(2): "require_once(/var/www/vhosts/kds-online.de/httpdocs/admin/includes/gm/classes/GMOpenSearch.php): failed to open stream: No such file or directory"

Fatal error: require_once(): Failed opening required '/var/www/vhosts/kds-online.de/httpdocs/admin/includes/gm/classes/GMOpenSearch.php' (include_path='.:/opt/plesk/php/7.1/share/pear') in /var/www/vhosts/kds-online.de/httpdocs/includes/application_top.php on line 233

COMPILE ERROR(64): "require_once(): Failed opening required '/var/www/vhosts/kds-online.de/httpdocs/admin/includes/gm/classes/GMOpenSearch.php' (include_path='.:/opt/plesk/php/7.1/share/pear')"