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

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This exception has no message.
java.lang.NullPointerException:
at vu.co.kaiyin.calculus.stewart.Fetcher$$anonfun$vu$co$kaiyin$calculus$stewart$Fetcher$$fetchFollowers$1.apply(GitHubGraph.scala:52)
at vu.co.kaiyin.calculus.stewart.Fetcher$$anonfun$vu$co$kaiyin$calculus$stewart$Fetcher$$fetchFollowers$1.apply(GitHubGraph.scala:51)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at scala.concurrent.impl.ExecutionContextImpl$AdaptedForkJoinTask.exec(ExecutionContextImpl.scala:121)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1253)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1346)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

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