set high-availability vrrp group GRP01 address 192.0.2.111/24
set high-availability vrrp group GRP01 interface 'eth1'
set high-availability vrrp group GRP01 vrid '254'

set high-availability vrrp group GRP01 address 192.0.2.112

  Error: 192.0.2.112 is not a valid IP host
  
  
  
  Invalid value
  Value validation failed
  Set failed

[edit]

vrrp_instance GRP01 {
    state BACKUP
    interface eth1
    virtual_router_id 254
    priority 100
    advert_int 1
    preempt_delay 0
    virtual_ipaddress {
        192.0.2.111/24
        192.0.2.122
        192.0.2.123
    }
}