error while invoking getClientLibrary(IWorkItemClient.class

I try to configure a code which was working with RTC 1.0. I have upgraded jar files to 2.0 version. Everything seems fine (no compilation errors), but I get NullPointerException while invoking IWorkItemClient workItemClient= (IWorkItemClient) teamRepository.getClientLibrary(IWorkItemClient.class);.


ArrayList<WorkItem> reopenList = new ArrayList<WorkItem>();
ITeamRepository teamRepository= TeamPlatform.getTeamRepositoryService().getTeamRepository(REPOSITORY_URI);
teamRepository.registerLoginHandler(new LoginHandler(userId, password));
teamRepository.login(null);

IProcessClientService processClient= (IProcessClientService) teamRepository.getClientLibrary(IProcessClientService.class);
IAuditableClient auditableClient= (IAuditableClient) teamRepository.getClientLibrary(IAuditableClient.class);
IWorkItemClient workItemClient= (IWorkItemClient) teamRepository.getClientLibrary(IWorkItemClient.class);



Exception in thread "main" java.lang.NullPointerException
at com.ibm.team.workitem.common.internal.WorkItemCommon.<init>(WorkItemCommon.java:156)
at com.ibm.team.workitem.client.internal.WorkItemClient.<init>(WorkItemClient.java:362)
at com.ibm.team.workitem.client.internal.WorkItemClientLibraryFactory.createClientLibrary(WorkItemClientLibraryFactory.java:17)
at com.ibm.team.repository.client.internal.ClientLibraryFactoryRegistry.getClientLibrary(ClientLibraryFactoryRegistry.java:89)
at com.ibm.team.repository.client.internal.TeamRepository.getClientLibrary(TeamRepository.java:460)
at impl.CreateWorkItem.run(CreateWorkItem.java:251)
at impl.WorkItemImporter.main(WorkItemImporter.java:39)

I have no idea what can cause it... teamRepository object has proper login, password and uri.