java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.xml.jaxb.JaxbNode.getOwnerDocument(JaxbNode.java:237)
at oracle.xml.jaxb.JaxbNode.setJaxbElement(JaxbNode.java:782)
at oracle.bpel.services.workflow.task.model.AttachmentTypeImpl.setContent(AttachmentTypeImpl.java:50)
at customworklistclilent.Main.addAttachment(Main.java:224)
at customworklistclilent.Main.queryTasks(Main.java:156)
at customworklistclilent.Main.main(Main.java:70)

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