I am trying to lookup a deployed resource adapter in WAS 6.1 using InitialContext JNDI lookup in my code...but getting the following exception....any help appreciated.

Exception stack trace: com.ibm.websphere.naming.CannotInstantiateObjectEx ception: Exception occurred while the JNDI NamingManager was processing a javax.naming.Reference object. [Root exception is javax.resource.ResourceException: No reference to the resource adapter]
at com.ibm.ws.naming.util.Helpers.processSerializedOb jectForLookupExt(Helpers.java:1000)
at com.ibm.ws.naming.util.Helpers.processSerializedOb jectForLookup(Helpers.java:705)
at com.ibm.ws.naming.jndicos.CNContextImpl.processRes olveResults(CNContextImpl.java:2097)
at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(C NContextImpl.java:1951)
at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(C NContextImpl.java:1866)
at com.ibm.ws.naming.jndicos.CNContextImpl.lookupExt( CNContextImpl.java:1556)
at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNC ontextImpl.java:1358)
at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCt x.java:172)
at javax.naming.InitialContext.lookup(InitialContext. java:363)