Hi, error codes are random letters and numbers that correspond to the same series in your error logs. You'll need to find the actual error by checking your error logs. https://www.socialengine.com/support/article/5112179/se-php-log-browser . You should then be able to see what the issue is.
2021-01-27T11:02:29+00:00 CRIT (2): Error Code: b5eb00 Zend_Db_Adapter_Mysqli_Exception: Table 'w6926_social.engine4_sesemailverification_verifications' doesn't exist in /var/www/vhosts/123kontakt.de/httpdocs/application/libraries/Zend/Db/Adapter/Mysqli.php:204 Stack trace<br><br><br>