org.eclipse.core.runtime.AssertionFailedException: null argument:

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org.eclipse.core.runtime.AssertionFailedException: null argument:
at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)
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)

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