When trying to export the GateIn Developer Guide (https://docs.jboss.org/author/display/GTNPORTAL/Developer+Guide) the following errors are encountered and the export fails. This only seems to be happening with that one document.

Error during Scroll DocBook export: System Error. Please contact your system admin and provide the information below.
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null
java.lang.NullPointerException
at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1025)
at org.apache.commons.io.IOUtils.copy(IOUtils.java:999)
at com.k15t.scroll.core.export.AbstractExporter.retrieveImage(AbstractExporter.java:97)
at com.k15t.scroll.core.export.AbstractExporter.retrieveImages(AbstractExporter.java:69)
at com.k15t.scroll.core.export.impl.DocbookZipExporter.export(DocbookZipExporter.java:39)
at com.k15t.scroll.client.confluence.export.LicenseDecorator.export(LicenseDecorator.java:59)
at com.k15t.scroll.client.confluence.export.ExportTask$1.doInTransaction(ExportTask.java:77)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127)
at com.k15t.scroll.client.confluence.export.ExportTask.runInternal(ExportTask.java:65)
at com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:21)
at java.lang.Thread.run(Thread.java:662)

and then:

The following error(s) occurred:

Error during Scroll DocBook file postprocessing: /services/confluence/temp/docbook_tools/transform-src-1321998250762-1321870121013/docbook.xml (No such file or directory)