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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:73)	at com.ibm.team.workitem.client.internal.WorkItemWorkingCopyRegistry.getWorkingCopy(WorkItemWorkingCopyRegistry.java:739)	at com.ibm.team.workitem.client.internal.WorkItemWorkingCopyManager.getWorkingCopy(WorkItemWorkingCopyManager.java:98)	at rtctool.RTCAdminTool.searchAttributeUsage(RTCAdminTool.java:291)	at rtctool.RTCAdminTool.handleChoice(RTCAdminTool.java:141)	at rtctool.RTCAdminTool.main(RTCAdminTool.java:95)