Cannot enable file_external app

Hello!

I tried to enable the external files app, but only got the following error:

Error no app in context OCP\AppFramework\QueryException: Could not resolve OCA\Files_External\Settings\Section! Class OCA\Files_External\Settings\Section does not exist

/var/www/nextcloud/htdocs/lib/private/AppFramework/Utility/SimpleContainer.php - line 117: OC\AppFramework\Utility\SimpleContainer->resolve(‘OCA\Files_Exter…’)
/var/www/nextcloud/htdocs/lib/private/ServerContainer.php - line 89: OC\AppFramework\Utility\SimpleContainer->query(‘OCA\Files_Exter…’)
/var/www/nextcloud/htdocs/lib/private/Settings/Manager.php - line 319: OC\ServerContainer->query(‘OCA\Files_Exter…’)
/var/www/nextcloud/htdocs/lib/private/Settings/Manager.php - line 353: OC\Settings\Manager->query(‘OCA\Files_Exter…’)
/var/www/nextcloud/htdocs/settings/Controller/AdminSettingsController.php - line 131: OC\Settings\Manager->getAdminSections()
/var/www/nextcloud/htdocs/settings/Controller/AdminSettingsController.php - line 70: OC\Settings\Controller\AdminSettingsController->getNavigationParameters(‘logging’)
[internal function] OC\Settings\Controller\AdminSettingsController->index(‘logging’)
/var/www/nextcloud/htdocs/lib/private/AppFramework/Http/Dispatcher.php - line 160: call_user_func_array(Array, Array)
/var/www/nextcloud/htdocs/lib/private/AppFramework/Http/Dispatcher.php - line 90: OC\AppFramework\Http\Dispatcher->executeController(Object(OC\Settings\Controller\AdminSettingsController), ‘index’)
/var/www/nextcloud/htdocs/lib/private/AppFramework/App.php - line 114: OC\AppFramework\Http\Dispatcher->dispatch(Object(OC\Settings\Controller\AdminSettingsController), ‘index’)
/var/www/nextcloud/htdocs/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47: OC\AppFramework\App main(‘OC\Settings\Con…’, ‘index’, Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
[internal function] OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
/var/www/nextcloud/htdocs/lib/private/Route/Router.php - line 299: call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
/var/www/nextcloud/htdocs/lib/base.php - line 1010: OC\Route\Router->match(’/settings/admin…’)
/var/www/nextcloud/htdocs/index.php - line 40: OC handleRequest()
{main}

Nextcloud is running with PHP 7.0 and nginx.

Any ideas?

Thank you!