DEFENDER ERROR Fatal error: Call to undefined method

hey,
project complete ERROR!
message:

Fatal error: Call to undefined method DateTime::diff() in /homepages/41/d382098620/htdocs/wp-content/plugins/wp-defender/app/module/audit-log-module/component/class-wd-audit-api.php on line 54

cant access in project. deactivate defender via ftp what nothing changes