🇬🇧United Kingdom @jpontet

I just wanted to note that I couldn't see the "Add field group" button either until I cleared the cache (`drush cr`)

I have the same error on v1.4.1 as well. I will also try downgrading to v1.4.0 to try to resolve it.
Has anyone been able to isolate the issue? Perhaps a patch?

@ronaldtebrake just wondered why it is necessary to wait for a v13 to get swiftmailer removed? And do you have a timeline for the v13 release?

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Sorry - been messing up the MR a bit :)
Anyway, here's a patch file for v8.x-1.x

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