Configuration SMTP

Bonjour tout le monde ,
Vraiment j'ai besoin de votre aide,

Le problème :
Apres avoir installer le module "SMTP Authentication Support" et l'Activer , j'ai essayée de le configurer ,
alors le problème c'est qu'il ne me donne pas l'interface pour configurer et remplir les champs mais il me
donne cette erreur

The website encountered an unexpected error. Please try again later.Drupal\Core\Config\ImmutableConfigException: Can not set values on immutable configuration smtp.settings:smtp_protocol. Use \Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object in Drupal\Core\Config\ImmutableConfig->set() (line 27 of core\lib\Drupal\Core\Config\ImmutableConfig.php).

Drupal\smtp\Form\SMTPConfigForm->buildForm(Array, Object)
call_user_func_array(Array, Array) (Line: 518)
Drupal\Core\Form\FormBuilder->retrieveForm('smtp_admin_settings', Object) (Line: 275)
Drupal\Core\Form\FormBuilder->buildForm('smtp_admin_settings', Object) (Line: 74)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 666)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

Vous trouverez en pièces jointes des images qui montre de quoi il s'agit

Vraiment j'ai chercher mais sans résultat , Merci d'avance pour votre aide .