snmpwalk: Unknown user name

[duwijakarta]

hello, please help

Can anyone help with the following case?
when I create a new device on the cacti server it says

xxxx@cacti-explore:~$ snmpwalk -v3 -l authPriv -u xxxx -a MD5 -A 'xxxxx' -x AES -X 'xxxx' 1xx.x.x.x
snmpwalk: Unknown user name

but if I set it with version 2 the results are successful
snmpwalk -c xxxx -v 2c

even though the settings on my switch are for version 3
snmp-server group xxxx v3 auth
snmp-server group xxxx v3 priv
snmp-server community xxxx RO
snmp-server host 1x.x.x version 3 priv xxxx udp-port 161

why does it always say "Unknown user name" when I set snmp version 3?
Are there any settings that need to be added?
Thank You

[Rno]

did you have a snmp user ?
do a show snmp user

[Rno]

Ho by the way, what is the device you testing ?