Problem with BGP4 MiB

Hello,
here is my bgp configs
bgp YYYYY {
neighbor 1.2.3250 {
address-family {
ipv4-unicast {
route-map {
export ASXXXX
import ASXXXX
}
soft-reconfiguration {
inbound
}
}
}
remote-as XXXX
}
neighbor 1.2.3254 {
address-family {
ipv4-unicast {
route-map {
export ASXXXX
import ASXXXX
}
soft-reconfiguration {
inbound
}
}
}
remote-as XXXX
}
neighbor 1.2.5.4 {
address-family {
ipv4-unicast {
route-map {
export ASYYYYY-OUT
import ASYYYYY-IN
}
soft-reconfiguration {
inbound
}
}
}
remote-as RRRRR
}
parameters {
router-id 1.2.31
}
}

but whne observium wants poll bgp4-mib , it gets Failed response,
any idea how to solv this?

Which VyOS version are you using?
Do you have configured service snmp?
Are others params gets via SNMP properly?