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

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java.lang.NullPointerException:
at org.dspace.app.sitemap.AbstractGenerator.closeCurrentFile(AbstractGenerator.java:138)
at org.dspace.app.sitemap.AbstractGenerator.finish(AbstractGenerator.java:155)
at org.dspace.app.sitemap.GenerateSitemaps.generateSitemaps(GenerateSitemaps.java:238)
at org.dspace.app.sitemap.GenerateSitemaps.main(GenerateSitemaps.java:110)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:183)

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