Error: Class 'Twig_Environment' not found in include() (line 16 of /home/iisunivac/public_html/sites/test/themes/tedxname-8.x-1.1-beta1/core/lib/Drupal/Core/Template/TwigEnvironment.php).
include() (Line: 440)
Composer\Autoload\includeFile('/home/iisunivac/public_html/sites/test/themes/tedxname-8.x-1.1-beta1/vendor/composer/../../core/lib/Drupal/Core/Template/TwigEnvironment.php') (Line: 322)
Composer\Autoload\ClassLoader->loadClass('Drupal\Core\Template\TwigEnvironment')
spl_autoload_call('Drupal\Core\Template\TwigEnvironment')
ReflectionMethod->__construct('Drupal\Core\Template\TwigEnvironment', 'addExtension') (Line: 86)
Drupal\Core\DependencyInjection\Compiler\TaggedHandlersPass->process(Object) (Line: 104)
Symfony\Component\DependencyInjection\Compiler\Compiler->compile(Object) (Line: 590)
Symfony\Component\DependencyInjection\ContainerBuilder->compile() (Line: 1263)
Drupal\Core\DrupalKernel->compileContainer() (Line: 866)
Drupal\Core\DrupalKernel->initializeContainer() (Line: 18)
Drupal\Core\Installer\InstallerKernel->initializeContainer() (Line: 461)
Drupal\Core\DrupalKernel->boot() (Line: 413)
install_begin_request(Object, Array) (Line: 113)
install_drupal(Object) (Line: 44)
Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException: You have requested a non-existent service "theme.manager". in Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition() (line 816 of /home/iisunivac/public_html/sites/test/themes/tedxname-8.x-1.1-beta1/vendor/symfony/dependency-injection/ContainerBuilder.php).
Symfony\Component\DependencyInjection\ContainerBuilder->getDefinition('theme.manager') (Line: 456)
Symfony\Component\DependencyInjection\ContainerBuilder->get('theme.manager') (Line: 647)
Drupal::theme() (Line: 22)
_drupal_maintenance_theme() (Line: 706)
drupal_maintenance_theme() (Line: 966)
install_display_output(Array, Array, Array) (Line: 264)
_drupal_log_error(Array, 1) (Line: 566)
_drupal_exception_handler(Object)