Class TYPO3\CMS\Extbase\Mvc\Controller\FlashMessageContainer does not exist
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al-Iskandar commented
Installing newsletter in Typo3 v7.2 (with compatibility6) produces error message "Class TYPO3\CMS\Extbase\Mvc\Controller\FlashMessageContainer does not exist" in the backend
PowerKiKi commented
Newsletter 2.4.1 was just released and fix TYPO3 7.2 compatibility.