Fatal error: Uncaught Error: Failed opening required '/var/customers/webs/untschule/drupal-10/vendor/composer/../../web/core/includes/bootstrap.inc' (include_path='/var/customers/webs/untschule/drupal-10/vendor/pear/archive_tar:/var/customers/webs/untschule/drupal-10/vendor/pear/console_getopt:/var/customers/webs/untschule/drupal-10/vendor/pear/pear-core-minimal/src:/var/customers/webs/untschule/drupal-10/vendor/pear/pear_exception:.:/usr/share/php/:/usr/share/php5/') in /var/customers/webs/untschule/drupal-10/vendor/composer/autoload_real.php:45
Stack trace:
#0 /var/customers/webs/untschule/drupal-10/vendor/composer/autoload_real.php(49): {closure}('2f69d3914119f04...', '/var/customers/...')
#1 /var/customers/webs/untschule/drupal-10/vendor/autoload.php(25): ComposerAutoloaderInit707f7590d632e07d7add8405a30a9cb8::getLoader()
#2 /var/customers/webs/untschule/drupal-10/web/autoload.php(15): require('/var/customers/...')
#3 /var/customers/webs/untschule/drupal-10/web/index.php(14): require_once('/var/customers/...')
#4 {main}
  thrown in /var/customers/webs/untschule/drupal-10/vendor/composer/autoload_real.php on line 45