Fatal error: Call to a member function has_cap()

Fatal error: Call to a member function has_cap() on a non-object in /opt/www/vhost/languageacademy.utm.my/httpdocs/wp-content/plugins/quick-status/quick-status.php on line 71

I've followed suggestion like previous post on this support forum, like fully network deactivate and delete and install fresh plugin, but nothing seem to work.