Error When adding Equipment plugin PHP Fatal error: Call to undefined method StaffSession:() in /var/www/html/hsms/public_html/include/class.nav.php on line 153, referer: http://10.64.162.18/hsms/public_html/scp/login.phpSteps followed inhttps://github.com/poctob/OSTEquipmentPlugin/wiki/InstallationPhp Version : PHP 5.5.38 (cli) (built: Mar 1 2018 11MySQL Version 5.6.40OSTEquipment Plugin 1.9.4osTicket-version 1.10.1class.nav.php has some issue, please help to fix the same