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

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at org.archive.crawler.framework.StatisticsTrackerImpl.writeCrawlReportTo(
at org.archive.crawler.framework.StatisticsTrackerImpl.writeReportTo(
at org.archive.crawler.framework.StatisticsTrackerImpl.writeReportFile(
at org.archive.crawler.framework.StatisticsTrackerImpl.dumpReports(
at org.archive.crawler.framework.AbstractTracker.finalTasks(
at org.archive.settings.SheetManager.closeModules(
at org.archive.crawler.framework.CrawlControllerImpl.completeStop(
at org.archive.crawler.framework.CrawlControllerImpl.noteFrontierState(

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