Additional uncaught exception thrown while handling exception.

Original

Error: Class "Drupal\Core\DependencyInjection\Compiler\ModifyServiceDefinitionsPass" not found in Drupal\Core\CoreServiceProvider->register() (line 60 of /var/www/html/cdemo/arvindfoundation/core/lib/Drupal/Core/CoreServiceProvider.php).

Drupal\Core\CoreServiceProvider->register() (Line: 1321)
Drupal\Core\DrupalKernel->compileContainer() (Line: 948)
Drupal\Core\DrupalKernel->initializeContainer() (Line: 20)
Drupal\Core\Installer\InstallerKernel->initializeContainer() (Line: 487)
Drupal\Core\DrupalKernel->boot() (Line: 426)
install_begin_request() (Line: 116)
install_drupal() (Line: 48)

Additional

Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "theme.manager". in Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition() (line 1030 of /var/www/html/cdemo/arvindfoundation/vendor/symfony/dependency-injection/ContainerBuilder.php).

Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition() (Line: 600)
Symfony\Component\DependencyInjection\ContainerBuilder->doGet() (Line: 558)
Symfony\Component\DependencyInjection\ContainerBuilder->get() (Line: 659)
Drupal::theme() (Line: 22)
_drupal_maintenance_theme() (Line: 506)
drupal_maintenance_theme() (Line: 1025)
install_display_output() (Line: 271)
_drupal_log_error() (Line: 365)
_drupal_exception_handler()