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

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java.lang.NullPointerException:
at java.io.Reader.(Reader.java:78)
at java.io.InputStreamReader.(InputStreamReader.java:129)
at scala.io.BufferedSource.reader(BufferedSource.scala:24)
at scala.io.BufferedSource.bufferedReader(BufferedSource.scala:25)
at scala.io.BufferedSource.scala$io$BufferedSource$$charReader$lzycompute(BufferedSource.scala:35)
at scala.io.BufferedSource.scala$io$BufferedSource$$charReader(BufferedSource.scala:33)
at scala.io.BufferedSource.scala$io$BufferedSource$$decachedReader(BufferedSource.scala:62)
at scala.io.BufferedSource.mkString(BufferedSource.scala:91)
at io.vamp.lifter.artifact.ArtifactInitializationActor$$anonfun$io$vamp$lifter$artifact$ArtifactInitializationActor$$loadResources$1$$anonfun$apply$3.apply(ArtifactInitializationActor.scala:69)
at io.vamp.lifter.artifact.ArtifactInitializationActor$$anonfun$io$vamp$lifter$artifact$ArtifactInitializationActor$$loadResources$1$$anonfun$apply$3.apply(ArtifactInitializationActor.scala:64)
at io.vamp.lifter.artifact.ArtifactInitializationActor$$anonfun$io$vamp$lifter$artifact$ArtifactInitializationActor$$loadResources$1.apply(ArtifactInitializationActor.scala:64)
at io.vamp.lifter.artifact.ArtifactInitializationActor$$anonfun$io$vamp$lifter$artifact$ArtifactInitializationActor$$loadResources$1.apply(ArtifactInitializationActor.scala:62)
at io.vamp.lifter.artifact.ArtifactInitializationActor$$anonfun$receive$1.applyOrElse(ArtifactInitializationActor.scala:43)
at io.vamp.lifter.artifact.ArtifactInitializationActor.aroundReceive(ArtifactInitializationActor.scala:26)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
at akka.actor.ActorCell.invoke(ActorCell.scala:495)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
at akka.dispatch.Mailbox.run(Mailbox.scala:224)
at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

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