On updating to Event Espresso 4 Core Regular v5.0.30.p we’re getting a Critical Error:
Error Details
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An error of type E_COMPILE_ERROR was caused in line 17 of the file /var/www/wp-content/plugins/eea-wp-user-integration/domain/entities/routing/EspressoEventEditor.php. Error message: Type of EventEspresso\WpUser\domain\entities\routing\EspressoEventEditor::$data_node must be ?EventEspresso\core\services\json\JsonDataNode (as in class EventEspresso\core\services\routing\Route)
I have the same error on my site. I had to disable the WordPress User Integration Plugin to get the site back up. You must disable the plugin manually.