I am getting below exception. I am not sure, are we supporting D8 on HHVM?
Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "theme.manager". in Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition() (line 819 of /var/lib/openshift/587cad237628e1327e000007/app-root/runtime/repo/www/vendor/symfony/dependency-injection/ContainerBuilder.php).
Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition('theme.manager') (Line: 463)
Symfony\Component\DependencyInjection\ContainerBuilder->get('theme.manager') (Line: 647)
Drupal::theme() (Line: 22)
_drupal_maintenance_theme() (Line: 706)
drupal_maintenance_theme() (Line: 965)
install_display_output(Array, Array, Array) (Line: 264)
_drupal_log_error(Array, 1) (Line: 84)
_drupal_error_handler_real(4096, 'Object of class Composer\Autoload\ClassLoader could not be converted to string', '/var/lib/openshift/587cad237628e1327e000007/app-root/runtime/repo/www/vendor/symfony/polyfill-apcu/bootstrap.php', 27, Array) (Line: 548)
_drupal_error_handler(4096, 'Object of class Composer\Autoload\ClassLoader could not be converted to string', '/var/lib/openshift/587cad237628e1327e000007/app-root/runtime/repo/www/vendor/symfony/polyfill-apcu/bootstrap.php', 27, Array, Array) (Line: 27)
apcu_store('drupal.file_cache.8.2.5..720584e122e29be0281eecc11bc1a0101bf0722da7fc3b95788d3b7a63f4636f:container_yaml_loader:/var/lib/openshift/587cad237628e1327e000007/app-root/runtime/repo/www/core/core.services.yml', Array) (Line: 21)
Drupal\Component\FileCache\ApcuFileCacheBackend->store('drupal.file_cache.8.2.5..720584e122e29be0281eecc11bc1a0101bf0722da7fc3b95788d3b7a63f4636f:container_yaml_loader:/var/lib/openshift/587cad237628e1327e000007/app-root/runtime/repo/www/core/core.services.yml', Array) (Line: 134)
Drupal\Component\FileCache\FileCache->set('core/core.services.yml', Array) (Line: 64)
Drupal\Core\DependencyInjection\YamlFileLoader->load('core/core.services.yml') (Line: 1224)
Drupal\Core\DrupalKernel->compileContainer() (Line: 866)
Drupal\Core\DrupalKernel->initializeContainer() (Line: 18)
Drupal\Core\Installer\InstallerKernel->initializeContainer() (Line: 461)
Drupal\Core\DrupalKernel->boot() (Line: 412)
install_begin_request(Object, Array) (Line: 112)
install_drupal(Object) (Line: 44)
