Solution for me: Remove Mailpoet premium and reinstall:
Download Premium plug-in here in your account:
https://account.mailpoet.com/account?ref=page-
https://kb.mailpoet.com/article/339-error-you-have-an-older-version-of-the-premium-plugin
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This reply was modified 2 years, 6 months ago by miliaan.
We got the same problem!
“You need to activate MailPoet version 4.39 or higher before you can use this version of MailPoet Premium
