When starting cman, "Relax-NG parse error : Reference SERVICE has no matching definition" printed on Red Hat Enterprise Linux 6

Issue

• The customer update the OS from RHEL6.0 to RHEL6.3 and there are validation errors seen.
• When starting cman, an error is shown but it starts successfully:

    # service cman start
    [root@pek-busiweb-1 ~]# /etc/init.d/cman  start  
    Starting cluster: 
       Checking if cluster has been disabled at boot... [  OK  ]
       Checking Network Manager... [  OK  ]
       Global setup... [  OK  ]
       Loading kernel modules... [  OK  ]
       Mounting configfs... [  OK  ]
       Starting cman... 
    /usr/share/cluster/cluster.rng:998: element ref: Relax-NG parser error : Reference VM has no matching definition
    /usr/share/cluster/cluster.rng:995: element ref: Relax-NG parser error : Reference SERVICE has no matching definition
    /usr/share/cluster/cluster.rng:995: element ref: Relax-NG parser error : Internal found no define for ref SERVICE
    /usr/share/cluster/cluster.rng:998: element ref: Relax-NG parser error : Internal found no define for ref VM
    Relax-NG schema /usr/share/cluster/cluster.rng failed to compile
    [  OK  ]
       Waiting for quorum... [  OK  ]
       Starting fenced... [  OK  ]
       Starting dlm_controld... [  OK  ]
       Starting gfs_controld... [  OK  ]
       Unfencing self... [  OK  ]
       Joining fence domain... [  OK  ]

• The cluster.conf will not propagate to all nodes in cluster and gives the following error:

#  cman_tool version -r
/usr/share/cluster/cluster.rng:1128: element define: Relax-NG parser error : Some defines for SERVICE needs the combine attribute
Relax-NG schema /usr/share/cluster/cluster.rng failed to compile
cman_tool: Not reloading, configuration is not valid