Additional uncaught exception thrown while handling exception.

Original

ReflectionException: Class Symfony\Cmf\Component\Routing\NestedMatcher\NestedMatcher does not exist in ReflectionMethod->__construct() (line 125 of /opt/httpd/vhosts/intoday.in/subdomains/cmslingo/httpdocs/core/lib/Drupal/Core/DependencyInjection/Compiler/TaggedHandlersPass.php).

ReflectionMethod->__construct('Symfony\Cmf\Component\Routing\NestedMatcher\NestedMatcher', 'addRouteFilter') (Line: 125)
Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass->processServiceCollectorPass(Array, 'router.matcher', Object) (Line: 97)
Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass->process(Object) (Line: 141)
Symfony\Component\DependencyInjection\Compiler\Compiler->compile(Object) (Line: 790)
Symfony\Component\DependencyInjection\ContainerBuilder->compile() (Line: 1318)
Drupal\Core\DrupalKernel->compileContainer() (Line: 892)
Drupal\Core\DrupalKernel->initializeContainer() (Line: 18)
Drupal\Core\Installer\InstallerKernel->initializeContainer() (Line: 468)
Drupal\Core\DrupalKernel->boot() (Line: 442)
install_begin_request(Object, Array) (Line: 122)
install_drupal(Object) (Line: 44)

Additional

Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "theme.manager". in Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition() (line 1063 of /opt/httpd/vhosts/intoday.in/subdomains/cmslingo/httpdocs/vendor/symfony/dependency-injection/ContainerBuilder.php).

Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition('theme.manager') (Line: 621)
Symfony\Component\DependencyInjection\ContainerBuilder->doGet('theme.manager', 1) (Line: 589)
Symfony\Component\DependencyInjection\ContainerBuilder->get('theme.manager') (Line: 684)
Drupal::theme() (Line: 21)
_drupal_maintenance_theme() (Line: 742)
drupal_maintenance_theme() (Line: 1034)
install_display_output(Array, Array, Array) (Line: 260)
_drupal_log_error(Array, 1) (Line: 602)
_drupal_exception_handler(Object)