Warning: require(/var/www/dampfi.ch/magento/vendor/magento/module-sales/registration.php): Failed to open stream: No such file or directory in /var/www/dampfi.ch/magento/vendor/composer/autoload_real.php on line 41

Fatal error: Uncaught Error: Failed opening required '/var/www/dampfi.ch/magento/vendor/composer/../magento/module-sales/registration.php' (include_path='.:/usr/share/php') in /var/www/dampfi.ch/magento/vendor/composer/autoload_real.php:41 Stack trace: #0 /var/www/dampfi.ch/magento/vendor/composer/autoload_real.php(45): {closure}() #1 /var/www/dampfi.ch/magento/vendor/autoload.php(25): ComposerAutoloaderInit9a41cba00cf44c2a4d09e69a15e937f5::getLoader() #2 /var/www/dampfi.ch/magento/app/autoload.php(51): include('...') #3 /var/www/dampfi.ch/magento/app/bootstrap.php(44): require_once('...') #4 /var/www/dampfi.ch/magento/pub/index.php(12): require('...') #5 {main} thrown in /var/www/dampfi.ch/magento/vendor/composer/autoload_real.php on line 41