unable to delete a user

Hi,

   I am unable to delete a user from the hyperic server.

The server.log from hyperic server shows

26-10-2012 14:02:12,149 CST DEBUG [pool-5-thread-1] [org.hyperic.hq.measurement.server.session.AvailabilityManagerImpl@1444] AvailabilityInserter sendDataToEventHandlers: 0 { Markers:  [isTriggerInterested=0] } , points {total=1, downEvents=0, eventsToPublish=0, zeventsToEnqueue=1}
26-10-2012 14:02:14,423 CST DEBUG [tomcat-http--12] [org.hyperic.hq.ui.util.RequestUtils@788] Propogating so: null
26-10-2012 14:02:14,425 CST DEBUG [tomcat-http--12] [org.hyperic.hq.ui.util.RequestUtils@788] Propogating sc: null
26-10-2012 14:02:14,449 CST ERROR [tomcat-http--12] [org.hyperic.hq.ui.util.UIErrorHandler@49] An exception was thrown for the following request URI '/admin/user/Remove.do'  :
java.lang.IllegalArgumentException: covalentAuthzRole is not a valid Appdef Resource Type
        at org.hyperic.hq.appdef.shared.AppdefUtil.newAppdefEntityId(AppdefUtil.java:136)
        at org.hyperic.hq.bizapp.server.session.AppdefBossImpl.resetResourceOwnership(AppdefBossImpl.java:2832)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)

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The java version is:- 1.6

Hyperic version:- 4.6.5

The error screen shot is attached.