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

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This exception has no message.
java.lang.NullPointerException:
at java.lang.System.arraycopy(Native Method)
at org.archive.crawler.frontier.BdbMultipleWorkQueues.get(BdbMultipleWorkQueues.java:228)
at org.archive.crawler.frontier.BdbWorkQueue.peekItem(BdbWorkQueue.java:91)
at org.archive.crawler.frontier.WorkQueue.peek(WorkQueue.java:144)
at org.archive.crawler.frontier.WorkQueueFrontier.next(WorkQueueFrontier.java:505)
at org.archive.crawler.framework.ToeThread.run(ToeThread.java:141)

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