IPADDR2 error

Last updated: Wed Mar 11 15:52:05 2015
Last change: Wed Mar 11 15:47:41 2015
Stack: corosync
Current DC: omni2 (20) - partition with quorum
Version: 1.1.12-272814b
2 Nodes configured
2 Resources configured

Online: [ omni1 omni2 ]

 test   (ocf::pacemaker:Dummy): Started omni1

Failed actions:
    vip_monitor_0 on omni1 'not installed' (5): call=12, status=complete, exit-reason='Setup problem: couldn't find command: ip', last-rc-change='Wed Mar 11 15:47:40 2015', queued=0ms, exec=100ms
    vip_monitor_0 on omni1 'not installed' (5): call=12, status=complete, exit-reason='Setup problem: couldn't find command: ip', last-rc-change='Wed Mar 11 15:47:40 2015', queued=0ms, exec=100ms
    vip_monitor_0 on omni2 'not installed' (5): call=17, status=complete, exit-reason='Setup problem: couldn't find command: ip', last-rc-change='Wed Mar 11 15:47:41 2015', queued=0ms, exec=336ms
    vip_monitor_0 on omni2 'not installed' (5): call=17, status=complete, exit-reason='Setup problem: couldn't find command: ip', last-rc-change='Wed Mar 11 15:47:41 2015', queued=0ms, exec=336ms