Additional uncaught exception thrown while handling exception.

Original

UnexpectedValueException: RecursiveDirectoryIterator::__construct(/var/www/html/sites/default): failed to open dir: Permission denied in RecursiveDirectoryIterator->__construct() (line 409 of /var/www/html/core/lib/Drupal/Core/Extension/ExtensionDiscovery.php).

RecursiveDirectoryIterator->__construct() (Line: 409)
Drupal\Core\Extension\ExtensionDiscovery->scanDirectory() (Line: 205)
Drupal\Core\Extension\ExtensionDiscovery->scan() (Line: 454)
install_begin_request() (Line: 114)
install_drupal() (Line: 44)

Additional

UnexpectedValueException: RecursiveDirectoryIterator::__construct(/var/www/html/sites/default): failed to open dir: Permission denied in RecursiveDirectoryIterator->__construct() (line 409 of /var/www/html/core/lib/Drupal/Core/Extension/ExtensionDiscovery.php).

RecursiveDirectoryIterator->__construct() (Line: 409)
Drupal\Core\Extension\ExtensionDiscovery->scanDirectory() (Line: 205)
Drupal\Core\Extension\ExtensionDiscovery->scan() (Line: 170)
Drupal\Core\Config\InstallStorage->getAllFolders() (Line: 95)
Drupal\Core\Config\InstallStorage->exists() (Line: 104)
Drupal\Core\Config\FileStorage->read() (Line: 131)
Drupal\Core\Config\FileStorage->readMultiple() (Line: 165)
Drupal\Core\Config\ConfigFactory->doLoadMultiple() (Line: 104)
Drupal\Core\Config\ConfigFactory->doGet() (Line: 89)
Drupal\Core\Config\ConfigFactory->get() (Line: 106)
Drupal\Core\Extension\ThemeHandler->listInfo() (Line: 64)
_drupal_maintenance_theme() (Line: 753)
drupal_maintenance_theme() (Line: 1028)
install_display_output() (Line: 267)
_drupal_log_error() (Line: 618)
_drupal_exception_handler()