[closed] What causes this exception on "check attribute usage" ?

Trying to troubleshoot a project configuration relating to a custom work item.  I'd like to execute the "check attribute usage in repository" but after a couple of seconds a failure dialog appears and in the Error Log:

com.ibm.team.repository.common.transport.ServiceMethodInvocationError: java.lang.UnsupportedOperationException
    at com.ibm.team.repository.transport.client.RemoteTeamService.getAppropriateException(RemoteTeamService.java:634)
    at com.ibm.team.repository.transport.client.RemoteTeamService.executeMethod(RemoteTeamService.java:506)
    at com.ibm.team.repository.transport.client.RemoteTeamService.invoke(RemoteTeamService.java:194)
    at com.ibm.team.repository.transport.client.ServiceInvocationHandler.invoke(ServiceInvocationHandler.java:43)
    at com.sun.proxy.$Proxy39.count(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invokeServiceCall(ServiceInterfaceProxy.java:164)
    at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invoke(ServiceInterfaceProxy.java:88)
    at com.sun.proxy.$Proxy39.count(Unknown Source)
    at com.ibm.team.workitem.common.internal.query.QueryCommon$2.run(QueryCommon.java:141)
    at com.ibm.team.workitem.common.internal.query.QueryCommon$2.run(QueryCommon.java:1)
    at com.ibm.team.workitem.client.internal.ClientServiceContext$1.run(ClientServiceContext.java:41)
    at com.ibm.team.repository.client.internal.TeamRepository$3.run(TeamRepository.java:1287)
    at com.ibm.team.repository.common.transport.CancelableCaller.call(CancelableCaller.java:79)
    at com.ibm.team.repository.client.internal.TeamRepository.callCancelableService(TeamRepository.java:1280)
    at com.ibm.team.workitem.client.internal.ClientServiceContext.callCancelableService(ClientServiceContext.java:45)
    at com.ibm.team.workitem.common.internal.query.QueryCommon.countQueryResults(QueryCommon.java:128)
    at com.ibm.team.workitem.common.internal.query.QueryCommon.countExpressionResults(QueryCommon.java:148)
    at com.ibm.team.workitem.ide.ui.internal.aspecteditor.type.TypeAspectEditor$4.runInBackground(TypeAspectEditor.java:430)
    at com.ibm.team.jface.internal.util.UIUpdateManager$BackgroundJob.runProtected(UIUpdateManager.java:58)
    at com.ibm.team.foundation.client.util.FoundationJob.run(FoundationJob.java:68)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.UnsupportedOperationException
    at com.ibm.team.workitem.common.internal.query.ExistsOperation.getPredicate(ExistsOperation.java:38)
    at com.ibm.team.workitem.service.internal.query.ASTTransformer.createExpressionPredicate(ASTTransformer.java:469)
    at com.ibm.team.workitem.service.internal.query.ASTTransformer.visit(ASTTransformer.java:360)
    at com.ibm.team.workitem.common.expression.AttributeExpression.accept(AttributeExpression.java:136)
    at com.ibm.team.workitem.service.internal.query.ASTTransformer.visit(ASTTransformer.java:313)
    at com.ibm.team.workitem.common.expression.Term.accept(Term.java:163)
    at com.ibm.team.workitem.service.internal.query.ASTTransformer.visit(ASTTransformer.java:313)
    at com.ibm.team.workitem.common.expression.Term.accept(Term.java:163)
    at com.ibm.team.workitem.service.internal.query.ASTTransformer.transform(ASTTransformer.java:252)
    at com.ibm.team.workitem.service.internal.query.QueryRepositoryService.count(QueryRepositoryService.java:325)
    at com.ibm.team.workitem.service.internal.query.QueryRepositoryService.count(QueryRepositoryService.java:321)
    at sun.reflect.GeneratedMethodAccessor439.invoke(null)