'Drupal\graph_mail\Plugin\Mail\GraphMail' does not implement method 'getEditableConfigNames'

This has been already fixed in the 2.0.x branch. The GraphMail class implements MailInterface and ContainerFactoryPluginInterface, which do not define that method.

Can you please share the patch link, if you have any?

I meant the development snapshot, not the alpha release: composer require 'drupal/graph_mail:2.0.x-dev@dev'.

I tried that.
Ran composer require 'drupal/graph_mail:2.0.x-dev@dev'
Enabled 'graph_mail' module. dursh en graph_mail
When I'm going drush cr it is giving a error, 'In CheckExceptionOnInvalidReferenceBehaviorPass.php line 86:
The service "graph_mail.helper" has a dependency on a non-existent service "queue.factory". Did you mean this: "im
age.factory"?'
If I go to extend page, it is showing enabled but setting page is not opening '/admin/config/services/graph_mail'

The service "graph_mail.helper" has a dependency on a non-existent service "queue.factory"

Is something that is normally solved after a cache clear. What happens if you try a cache clear again?

when I'm doing 'drush cr' I'm still getting the same error.

I just reinstalled the alpha version. Now I'm able to enable the module and also can able to configure the module but it is giving the same fatal error when sending mail.

hi,

is there any update? can you please help me to resolve the issue?

Thanks,
Soutam