Fatal error while saving in Gridbox

Hi when we try to save an article in the blogging app (but also in pages while saving a page) we get an error 500.

If we activate the PHP error displaying we get: "Fatal error: Class Balbooa\Plugin\Finder\Gridbox\Extension\Gridbox contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Joomla\Event\SubscriberInterface::getSubscribedEvents)".

We are using PHP 8.2.20 and MySQL 8.0.36-28 on SiteGround.

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