Add SBC cluster in SDM 8.1.

Hello,

I installed SDM 8.1.1 and I am trying to add my cluster on it but when I go to add Device I get:

I put password I have for admin user (small letter, big letters and numbers)

on the SBC I have

snmp-enabled                            enabled

        enable-snmp-auth-traps                  enabled

        enable-snmp-syslog-notify               enabled

        enable-snmp-monitor-traps               enabled

        enable-env-monitor-traps                enabled

        enable-mblk_tracking                    disabled

        enable-l2-miss-report                   enabled

.....

snmp-agent-mode                         v1v2

in system-config

and I configured snmp-community:

snmp-community

        community-name                          ipdirections

        access-mode                             READ-ONLY

        ip-addresses                            172.18.2.15

                                                172.18.2.16

                                                172.18.2.227

                                                172.18.2.228

What is the error that it shows? Is there anything else I need to configure?