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Unknown TypeError when MailerHelper::createTransportAdapter is initializing #4552
Steps to reproduce
I can’t reproduce this; if I use a custom mailer plugin such as Mandrill, and then composer-remove the package, all I get on the Settings → Email page is a validation error below the Transport Type setting (“The transport type “” could not be found.”), but otherwise the page loads normally.
Can you please send your
I finally found that these lines were missing in the
This was probably linked to my project.yaml version error (#4546).