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

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java.lang.NoClassDefFoundError:
at org.xbill.DNS.dns.getRecords(dns.java:128)
at org.archive.crawler.fetcher.FetchDNS.innerProcess(FetchDNS.java:167)
at org.archive.crawler.framework.Processor.process(Processor.java:101)
at org.archive.crawler.framework.ToeThread.processCrawlUri(ToeThread.java:169)
at org.archive.crawler.framework.ToeThread.run(ToeThread.java:124)

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