Not working on 4.3

1

Fatal error: Call to a member function unserializeContentClassAttribute() on a non-object in /home/user/public_html/ezpublish-4.3.0/kernel/classes/packagehandlers/ezcontentclass/ezcontentclasspackagehandler.php on line 390
Fatal error: eZ Publish did not finish its request
The execution of eZ Publish was abruptly ended, debug information can be found in the log files normally placed in var/log/*