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This exception has no message.
java.util.NoSuchElementException: 	at java.util.TreeMap.key(	at java.util.TreeMap.firstKey(	at	at org.apache.nutch.util.CrawlTestUtil.readContents(	at org.apache.nutch.crawl.TestInjector.readDb(	at org.apache.nutch.crawl.TestInjector.testInject(