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java.lang.NullPointerException: 	at org.archive.modules.writer.WARCWriterProcessor.write(WARCWriterProcessor.java:284)	at org.archive.modules.writer.WARCWriterProcessor.innerProcessResult(WARCWriterProcessor.java:209)	at org.archive.modules.Processor.process(Processor.java:142)	at org.archive.modules.ProcessorChain.process(ProcessorChain.java:131)	at org.archive.crawler.framework.ToeThread.run(ToeThread.java:151)