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java.lang.NullPointerException: 	at java.util.TreeMap.compare(TreeMap.java:1093)	at java.util.TreeMap.put(TreeMap.java:465)	at java.util.TreeSet.add(TreeSet.java:210)	at java.util.Collections$SynchronizedCollection.add(Collections.java:1581)	at org.archive.crawler.frontier.BdbFrontier$4.put(BdbFrontier.java:326)	at org.archive.crawler.frontier.BdbFrontier.put(BdbFrontier.java:375)	at org.archive.crawler.frontier.BdbFrontier.resurrectOneQueueState(BdbFrontier.java:359)	at org.archive.crawler.frontier.BdbFrontier.resurrectQueueState(BdbFrontier.java:329)	at org.archive.crawler.frontier.BdbFrontier.initQueue(BdbFrontier.java:272)	at org.archive.crawler.frontier.WorkQueueFrontier.initialize(WorkQueueFrontier.java:269)	at org.archive.crawler.frontier.BdbFrontier.initialize(BdbFrontier.java:467)	at org.archive.crawler.framework.CrawlController.setupCrawlModules(CrawlController.java:652)	at org.archive.crawler.framework.CrawlController.initialize(CrawlController.java:378)	at org.archive.crawler.admin.CrawlJob.startCrawling(CrawlJob.java:777)	at org.archive.crawler.admin.CrawlJobHandler.startNextJobInternal(CrawlJobHandler.java:1120)	at org.archive.crawler.admin.CrawlJobHandler$2.run(CrawlJobHandler.java:1103)	at java.lang.Thread.run(Thread.java:595)