java.lang.RuntimeException: java.lang.NullPointerException

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java.lang.NullPointerException
java.lang.RuntimeException: java.lang.NullPointerException
at org.apache.xalan.transformer.TransformerImpl.run(TransformerImpl.java:3418)
at org.jasig.portal.utils.SAX2FilterImpl.endDocument(SAX2FilterImpl.java:684)
at org.jasig.portal.utils.SAX2FilterImpl.endDocument(SAX2FilterImpl.java:684)
at org.jasig.portal.layout.AggregatedLayout.writeTo(AggregatedLayout.java:448)
at org.jasig.portal.layout.AggregatedLayoutManager.getUserLayout(AggregatedLayoutManager.java:915)
at org.jasig.portal.layout.TransientUserLayoutManagerWrapper.getUserLayout(TransientUserLayoutManagerWrapper.java:134)
at org.jasig.portal.UserInstance.renderState(UserInstance.java:527)
at org.jasig.portal.UserInstance.writeContent(UserInstance.java:205)
at org.jasig.portal.PortalSessionManager.doGet(PortalSessionManager.java:269)

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