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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)