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

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java.lang.NullPointerException:
at org.archive.processors.util.RobotsExclusionPolicy.disallows(RobotsExclusionPolicy.java:156)
at org.archive.crawler.prefetch.PreconditionEnforcer.considerRobotsPreconditions(PreconditionEnforcer.java:195)
at org.archive.crawler.prefetch.PreconditionEnforcer.innerProcessResult(PreconditionEnforcer.java:129)
at org.archive.processors.Processor.process(Processor.java:118)
at org.archive.crawler.framework.ToeThread.processCrawlUri(ToeThread.java:295)
at org.archive.crawler.framework.ToeThread.run(ToeThread.java:150)

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