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

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java.lang.NullPointerException:
at net.sourceforge.jnlp.cache.ResourceTracker.initializeResource(ResourceTracker.java:778)
at net.sourceforge.jnlp.cache.ResourceTracker.processResource(ResourceTracker.java:611)
at net.sourceforge.jnlp.cache.ResourceTracker.access$500(ResourceTracker.java:72)
at net.sourceforge.jnlp.cache.ResourceTracker$Downloader$1.run(ResourceTracker.java:1115)
at net.sourceforge.jnlp.cache.ResourceTracker$Downloader$1.run(ResourceTracker.java:1113)
at net.sourceforge.jnlp.cache.ResourceTracker$Downloader.run(ResourceTracker.java:1113)
at java.lang.Thread.run(Thread.java:679)

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