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

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java.lang.NullPointerException:
at org.icepdf.core.pobjects.Document.getPageTree(Document.java:1204)
at org.icepdf.ri.common.SwingController.getPageTree(SwingController.java:3232)
at org.icepdf.ri.common.SwingController.reflectStateInComponents(SwingController.java:1046)
at org.icepdf.ri.common.SwingController.setToolBarVisible(SwingController.java:2806)

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