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

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java.lang.NullPointerException:
at co.paralleluniverse.strands.Strand.parkNanos(Strand.java:670)
at co.paralleluniverse.strands.ConditionSynchronizer.awaitNanos(ConditionSynchronizer.java:79)
at co.paralleluniverse.strands.dataflow.Val.get(Val.java:188)
at co.paralleluniverse.fibers.Fiber.get(Fiber.java:1370)
at co.paralleluniverse.fibers.Fiber.join(Fiber.java:1343)

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