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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)