Help with snmp v3

[iscadiaz]

Hi iam configuring a cacti server with a cisco router and i need to make snmp v3 for autentification, i make this cisco configuration:

snmp-server view readview mib-2 included
snmp-server view readview internet included
snmp-server group readonly v3 auth read readview access 99
Router(config)#snmp-server user mrbyte readonly v3 auth md5 password

whit this comand i have answer from router
home# snmpwalk -v3 -u mrbyte -l authNoPriv -a MD5 -A password X.X.X.X .1

but i get a snmp error message from cacti server

any idea???