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java.lang.NullPointerException: 	at org.archive.io.WriterPoolMember.postWriteRecordTasks(WriterPoolMember.java:387)	at org.archive.io.warc.WARCWriter.writeRecord(WARCWriter.java:283)	at org.archive.io.warc.WARCWriter.writeResponseRecord(WARCWriter.java:489)	at org.archive.crawler.writer.WARCWriterProcessor.writeResponse(WARCWriterProcessor.java:426)	at org.archive.crawler.writer.WARCWriterProcessor.writeDnsRecords(WARCWriterProcessor.java:331)	at org.archive.crawler.writer.WARCWriterProcessor.write(WARCWriterProcessor.java:221)	at org.archive.crawler.writer.WARCWriterProcessor.innerProcess(WARCWriterProcessor.java:192)	at org.archive.crawler.framework.Processor.process(Processor.java:109)	at org.archive.crawler.framework.ToeThread.processCrawlUri(ToeThread.java:306)	at org.archive.crawler.framework.ToeThread.run(ToeThread.java:154)