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This exception has no message.
java.lang.NullPointerException: 	at org.dspace.embargo.EmbargoManager.getEmbargoDate(EmbargoManager.java:166)	at org.dspace.content.InstallItem.installItem(InstallItem.java:94)	at org.dspace.content.InstallItem.installItem(InstallItem.java:71)	at org.dspace.workflow.WorkflowManager.archive(WorkflowManager.java:660)	at org.dspace.workflow.WorkflowManager.doState(WorkflowManager.java:614)	at org.dspace.workflow.WorkflowManager.doState(WorkflowManager.java:590)	at org.dspace.workflow.WorkflowManager.doState(WorkflowManager.java:554)	at org.dspace.workflow.WorkflowManager.doState(WorkflowManager.java:514)	at org.dspace.workflow.WorkflowManager.start(WorkflowManager.java:199)	at org.dspace.submit.step.CompleteStep.doProcessing(CompleteStep.java:116)