Additional uncaught exception thrown while handling exception.

Original

TypeError: Argument 1 passed to Drupal\Core\Extension\ThemeHandler::addTheme() must be an instance of Drupal\Core\Extension\Extension, null given, called in /var/www/html/rcb/web/core/includes/theme.maintenance.inc on line 73 in Drupal\Core\Extension\ThemeHandler->addTheme() (line 118 of /var/www/html/rcb/web/core/lib/Drupal/Core/Extension/ThemeHandler.php).

Drupal\Core\Extension\ThemeHandler->addTheme(NULL) (Line: 73)
_drupal_maintenance_theme() (Line: 749)
drupal_maintenance_theme() (Line: 518)
install_begin_request(Object, Array) (Line: 114)
install_drupal(Object) (Line: 44)

Additional

TypeError: Argument 1 passed to Drupal\Core\Extension\ThemeHandler::addTheme() must be an instance of Drupal\Core\Extension\Extension, null given, called in /var/www/html/rcb/web/core/includes/theme.maintenance.inc on line 73 in Drupal\Core\Extension\ThemeHandler->addTheme() (line 118 of /var/www/html/rcb/web/core/lib/Drupal/Core/Extension/ThemeHandler.php).

Drupal\Core\Extension\ThemeHandler->addTheme(NULL) (Line: 73)
_drupal_maintenance_theme() (Line: 749)
drupal_maintenance_theme() (Line: 1028)
install_display_output(Array, Array, Array) (Line: 267)
_drupal_log_error(Array, 1) (Line: 614)
_drupal_exception_handler(Object)