Problem with HP devices & radius configuration

Dear, While configuring users to allow access to HP devices in users.conf with parameter HP-VC-Groups = "vcadmingroup"; it throws error as '/usr/app/radius-new/prod-oob-internal/etc/raddb/mods-config/files/authorize[139]: Parse error (reply) for entry DEFAULT: Unknown attribute "HP-VC-Groups" Could you please help here with correct configuration guidelines..? Thanks & Kind Regards, Saurabh LAHOTI