I got the similar exception when I tried using accept team invitation following the following instruction:
=======================================================
Use File>Accept Team Invitation within the Rational Team Concert client to open the Accept Team Invitation dialog.
Copy the invitation below and paste into the Accept Invitation text field.

teamRepository=https://jazzdev.torolab.ibm.com:9443/jazz/
userId=wlu
userName=Weiping Lu
projectAreaName=Rational Team Concert
teamAreaPath=/Community
=======================================================


!ENTRY com.ibm.team.process.ide.ui 4 4 2009-03-04 09:32:42.864
!MESSAGE Exception occurred during team invitation generation
!STACK 0
com.ibm.team.repository.common.TeamRepositoryException: org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Feature 'contextId' not found. (, 18, 18)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:67)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:522)
at com.ibm.team.repository.transport.client.RemoteTeamService.getAppropriateException(RemoteTeamService.java:641)
at com.ibm.team.repository.transport.client.RemoteTeamService.executeMethod(RemoteTeamService.java:474)
at com.ibm.team.repository.transport.client.RemoteTeamService.invoke(RemoteTeamService.java:184)
at com.ibm.team.repository.transport.client.ServiceInvocationHandler.invoke(ServiceInvocationHandler.java:43)
at $Proxy0.describe(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:618)
at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invokeServiceCall(ServiceInterfaceProxy.java:149)
at com.ibm.team.repository.client.internal.ServiceInterfaceProxy.invoke(ServiceInterfaceProxy.java:84)
at $Proxy0.describe(Unknown Source)
at com.ibm.team.repository.client.internal.TeamRepository$4.run(TeamRepository.java:1342)
at com.ibm.team.repository.client.internal.TeamRepository$4.run(TeamRepository.java:1)
at com.ibm.team.repository.client.internal.TeamRepository$3.run(TeamRepository.java:1129)
at com.ibm.team.repository.common.transport.CancelableCaller.call(CancelableCaller.java:76)
at com.ibm.team.repository.client.internal.TeamRepository.callCancelableService(TeamRepository.java:1122)
at com.ibm.team.repository.client.internal.TeamRepository.internalLogin(TeamRepository.java:1335)
at com.ibm.team.repository.client.internal.TeamRepository.login(TeamRepository.java:536)
at com.ibm.team.process.internal.ide.ui.views.AcceptTeamInvitationWizard.createRepositoryConnection(AcceptTeamInvitationWizard.java:185)
at com.ibm.team.process.internal.ide.ui.views.AcceptTeamInvitationWizard.doFinish(AcceptTeamInvitationWizard.java:133)
at com.ibm.team.process.internal.ide.ui.views.AcceptTeamInvitationWizard$1.run(AcceptTeamInvitationWizard.java:105)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)
Caused by: com.ibm.team.repository.common.internal.marshal.MarshallingException: org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Feature 'contextId' not found. (, 18, 18)
at com.ibm.team.repository.common.internal.marshal.impl.EObjectMarshaller.demarshalInputStreamToObject(EObjectMarshaller.java:486)
at com.ibm.team.repository.transport.client.RemoteTeamService.demarshallEnvelope(RemoteTeamService.java:539)
at com.ibm.team.repository.transport.client.RemoteTeamService.invokePost(RemoteTeamService.java:505)
at com.ibm.team.repository.transport.client.RemoteTeamService.executeMethod(RemoteTeamService.java:449)
... 21 more
Caused by: org.eclipse.emf.ecore.resource.Resource$IOWrappedException: Feature 'contextId' not found. (, 18, 18)
at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.handleErrors(XMLLoadImpl.java:81)
at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:189)
at com.ibm.team.repository.common.internal.marshal.util.WebServicesXMLLoadImpl.load(WebServicesXMLLoadImpl.java:76)
at org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:180)
at com.ibm.team.repository.common.internal.marshal.impl.EObjectMarshaller.demarshalInputStreamToObject(EObjectMarshaller.java:483)
... 24 more
Caused by: org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature 'contextId' not found. (, 18, 18)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.reportUnknownFeature(XMLHandler.java:1867)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleUnknownFeature(XMLHandler.java:1831)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleFeature(XMLHandler.java:1775)
at com.ibm.team.repository.common.internal.marshal.util.WebServicesSAXXMLHandler.handleFeature(WebServicesSAXXMLHandler.java:52)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.processElement(XMLHandler.java:985)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:964)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:695)
at com.ibm.team.repository.common.internal.marshal.util.SAXWrapper.startElement(SAXWrapper.java:81)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:179)
... 27 more

Sorry, I was using rtc-1.0.1. If I used rtc-2.0, it works fine.