GC with RQM projects - How to retrieve the component lists of a project area

Using RQM603 with Global Configuration, we have tried to use plain java client library to retrieve the component lists of a project area.
We were able to retrieve requirement project's component list, but we got the following error message when we tried to retrieve component list from a RQM project.

=================run time error message=================================
Contacting https://rqm-qm-dev-n2.xxx.com:9443/qm/...
Connected to https://rqm-qm-dev-n2.xxx.com:9443/qm/
ProjectArea name:Integrated Development 1 (Quality Management)
com.ibm.team.repository.common.transport.ServiceNotAvailableException: CRJAZ0106E The server is temporarily unavailable. The request for the following URL was denied: /qm/service/com.ibm.team.scm.common.internal.IScmQueryService.
at com.ibm.team.repository.transport.client.RemoteTeamServer.executeMethod(RemoteTeamServer.java:1266)
at com.ibm.team.repository.transport.client.RemoteTeamServer.executeMethod(RemoteTeamServer.java:1121)
at com.ibm.team.repository.transport.client.RemoteTeamService.executeCancelableHttpMethod(RemoteTeamService.java:660)
at com.ibm.team.repository.transport.client.RemoteTeamService.invokePost(RemoteTeamService.java:605)
at com.ibm.team.repository.transport.client.RemoteTeamService.executeMethod(RemoteTeamService.java:548)
at com.ibm.team.repository.transport.client.RemoteTeamService.invoke(RemoteTeamService.java:202)
at com.ibm.team.repository.transport.client.ServiceInvocationHandler.invoke(ServiceInvocationHandler.java:43)
at com.sun.proxy.$Proxy17.findWorkspaces(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invokeServiceCall(ServiceInterfaceProxy.java:254)
at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invoke(ServiceInterfaceProxy.java:110)
at com.sun.proxy.$Proxy17.findWorkspaces(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.ibm.team.scm.client.internal.ScmServiceInterfaceProxy$2.run(ScmServiceInterfaceProxy.java:168)
at com.ibm.team.repository.client.internal.TeamRepository$3.run(TeamRepository.java:1328)
at com.ibm.team.repository.common.transport.CancelableCaller.call(CancelableCaller.java:79)
at com.ibm.team.repository.client.internal.TeamRepository.callCancelableService(TeamRepository.java:1323)
at com.ibm.team.scm.client.internal.ScmClientLibraryContext.callCancelableService(ScmClientLibraryContext.java:71)
at com.ibm.team.scm.client.internal.ScmServiceInterfaceProxy.invokeCancelableService(ScmServiceInterfaceProxy.java:164)
at com.ibm.team.scm.client.internal.ScmServiceInterfaceProxy.invoke(ScmServiceInterfaceProxy.java:92)
at com.sun.proxy.$Proxy17.findWorkspaces(Unknown Source)
at com.ibm.team.scm.client.internal.WorkspaceManager.findWorkspaces(WorkspaceManager.java:1953)
at RTC.ProcessUtil.getAllComponentNames(ProcessUtil.java:380)
at RTC.RTCrunner.getAllComponents(RTCrunner.java:85)
at ProjectAreaExe.main(ProjectAreaExe.java:75)
Exception in thread "main" java.lang.NullPointerException
at ProjectAreaExe.main(ProjectAreaExe.java:89)
================end of=run time error message=================================


===============source code================================================
public static List<String> getAllComponentNames(ITeamRepository teamRepository,IProgressMonitor progressMonitor ) throws TeamRepositoryException{
 List <String> componentList= new ArrayList<String>();
 IWorkspaceManager workspaceManager = SCMPlatform.getWorkspaceManager(teamRepository);
 IWorkspaceSearchCriteria stcriteria = IWorkspaceSearchCriteria.FACTORY.newInstance();
 stcriteria.setKind(IWorkspaceSearchCriteria.STREAMS);
 IProcessItemService processService = (IProcessItemService)teamRepository.getClientLibrary(IProcessItemService.class);
List<IProjectArea> projectAreas = processService.findAllProjectAreas(IProcessClientService.ALL_PROPERTIES, null);
for (IProjectArea area : projectAreas) {
System.out.println("ProjectArea name:"+area.getName());

stcriteria.setPartialOwnerNameIgnoreCase(area.getName());
List <IWorkspaceHandle> workspaceHandles = workspaceManager.findWorkspaces(stcriteria,Integer.MAX_VALUE,progressMonitor);
if(!workspaceHandles.isEmpty()){
IWorkspaceConnection workspaceConnection = workspaceManager.getWorkspaceConnection(workspaceHandles.get(0),progressMonitor);
@SuppressWarnings("rawtypes")
List components = teamRepository.itemManager().fetchCompleteItems(workspaceConnection.getComponents(), IItemManager.DEFAULT, null);
for (Iterator<IComponent> it = components.iterator(); it.hasNext();) {
IComponent component = it.next();
componentList.add(component.getName());
System.out.println("Components: ");
System.out.println(component.getName());
}
}

}

return componentList;

}
===================end of source code ===============================

Please help- What's wrong with the code or what's wrong with the project setup.