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org.eclipse.core.runtime.AssertionFailedException: null argument:	at org.eclipse.core.runtime.Assert.isNotNull(	at org.eclipse.core.runtime.Assert.isNotNull(	at	at	at rtctool.RTCAdminTool.searchAttributeUsage(	at rtctool.RTCAdminTool.handleChoice(	at rtctool.RTCAdminTool.main(