TypeError: Drupal\Core\Extension\ThemeHandler::addTheme(): Argument #1 ($theme) must be of type Drupal\Core\Extension\Extension, null given, called in /mnt/www/html/abi01live/docroot/core/includes/theme.maintenance.inc on line 70 in Drupal\Core\Extension\ThemeHandler->addTheme() (line 82 of /mnt/www/html/abi01live/docroot/core/lib/Drupal/Core/Extension/ThemeHandler.php).
Drupal\Core\Extension\ThemeHandler->addTheme(NULL) (Line: 70) _drupal_maintenance_theme() (Line: 322) drupal_maintenance_theme() (Line: 514) install_begin_request(Object, Array) (Line: 116) install_drupal(Object) (Line: 48)
TypeError: Drupal\Core\Extension\ThemeHandler::addTheme(): Argument #1 ($theme) must be of type Drupal\Core\Extension\Extension, null given, called in /mnt/www/html/abi01live/docroot/core/includes/theme.maintenance.inc on line 70 in Drupal\Core\Extension\ThemeHandler->addTheme() (line 82 of /mnt/www/html/abi01live/docroot/core/lib/Drupal/Core/Extension/ThemeHandler.php).
Drupal\Core\Extension\ThemeHandler->addTheme(NULL) (Line: 70) _drupal_maintenance_theme() (Line: 322) drupal_maintenance_theme() (Line: 1023) install_display_output(Array, Array) (Line: 271) _drupal_log_error(Array, 1) (Line: 182) _drupal_exception_handler(Object)