Uncaught error from thread [reactivemongo-akka.actor.default-dispatcher-6] shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled for ActorSystem[reactivemongo]
java.lang.NoSuchMethodError: akka.actor.ActorSystem.dispatcher()Lakka/dispatch/MessageDispatcher;
at reactivemongo.core.actors.MongoDBSystem.<init>(actors.scala:121)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at akka.actor.CreatorFunctionConsumer.produce(Props.scala:369)
at akka.actor.Props.newActor(Props.scala:323)
at akka.actor.ActorCell.newActor(ActorCell.scala:534)
at akka.actor.ActorCell.create(ActorCell.scala:560)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:425)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:447)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:262)
at akka.dispatch.Mailbox.run(Mailbox.scala:218)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
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)
[ERROR] [10/15/2013 01:10:34.697] [reactivemongo-akka.actor.default-dispatcher-6] [ActorSystem(reactivemongo)] Uncaught error from thread [reactivemongo-akka.actor.default-dispatcher-6] shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled
java.lang.NoSuchMethodError: akka.actor.ActorSystem.dispatcher()Lakka/dispatch/MessageDispatcher;
at reactivemongo.core.actors.MongoDBSystem.<init>(actors.scala:121)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at akka.actor.CreatorFunctionConsumer.produce(Props.scala:369)
at akka.actor.Props.newActor(Props.scala:323)
at akka.actor.ActorCell.newActor(ActorCell.scala:534)
at akka.actor.ActorCell.create(ActorCell.scala:560)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:425)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:447)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:262)
at akka.dispatch.Mailbox.run(Mailbox.scala:218)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
[ERROR] [10/15/2013 01:10:34.698] [reactivemongo-akka.actor.default-dispatcher-3] [akka://reactivemongo/user/$a] head of empty list
java.util.NoSuchElementException: head of empty list
at scala.collection.immutable.Nil$.head(List.scala:337)
at scala.collection.immutable.Nil$.head(List.scala:334)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:498)
at akka.actor.ActorCell.invoke(ActorCell.scala:456)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:237)
at akka.dispatch.Mailbox.run(Mailbox.scala:219)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
[ERROR] [10/15/2013 01:10:34.700] [reactivemongo-akka.actor.default-dispatcher-4] [akka://reactivemongo/user/$a] changing Recreate into Create after java.util.NoSuchElementException: head of empty list
Uncaught error from thread [reactivemongo-akka.actor.default-dispatcher-4] shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled for ActorSystem[reactivemongo]
java.lang.NoSuchMethodError: akka.actor.ActorSystem.dispatcher()Lakka/dispatch/MessageDispatcher;
at reactivemongo.core.actors.MongoDBSystem.<init>(actors.scala:121)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at akka.actor.CreatorFunctionConsumer.produce(Props.scala:369)
at akka.actor.Props.newActor(Props.scala:323)
at akka.actor.ActorCell.newActor(ActorCell.scala:534)
at akka.actor.ActorCell.create(ActorCell.scala:560)
at akka.actor.dungeon.FaultHandling$class.finishCreate(FaultHandling.scala:135)
at akka.actor.dungeon.FaultHandling$class.faultCreate(FaultHandling.scala:129)
at akka.actor.ActorCell.faultCreate(ActorCell.scala:338)
at akka.actor.dungeon.FaultHandling$class.faultRecreate(FaultHandling.scala:58)
at akka.actor.ActorCell.faultRecreate(ActorCell.scala:338)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:428)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:447)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:262)
at akka.dispatch.Mailbox.run(Mailbox.scala:218)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
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)
[ERROR] [10/15/2013 01:10:34.714] [reactivemongo-akka.actor.default-dispatcher-4] [ActorSystem(reactivemongo)] Uncaught error from thread [reactivemongo-akka.actor.default-dispatcher-4] shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled
java.lang.NoSuchMethodError: akka.actor.ActorSystem.dispatcher()Lakka/dispatch/MessageDispatcher;
at reactivemongo.core.actors.MongoDBSystem.<init>(actors.scala:121)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at reactivemongo.api.MongoDriver$$anonfun$3.apply(api.scala:238)
at akka.actor.CreatorFunctionConsumer.produce(Props.scala:369)
at akka.actor.Props.newActor(Props.scala:323)
at akka.actor.ActorCell.newActor(ActorCell.scala:534)
at akka.actor.ActorCell.create(ActorCell.scala:560)
at akka.actor.dungeon.FaultHandling$class.finishCreate(FaultHandling.scala:135)
at akka.actor.dungeon.FaultHandling$class.faultCreate(FaultHandling.scala:129)
at akka.actor.ActorCell.faultCreate(ActorCell.scala:338)
at akka.actor.dungeon.FaultHandling$class.faultRecreate(FaultHandling.scala:58)
at akka.actor.ActorCell.faultRecreate(ActorCell.scala:338)
at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:428)
at akka.actor.ActorCell.systemInvoke(ActorCell.scala:447)
at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:262)
at akka.dispatch.Mailbox.run(Mailbox.scala:218)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
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)
Currently I'm using Scala 2.10.3, ReactiveMongo 0.9, SBT 0.13 on Mountain Lion. Still not get why there is error. Need some help from everybody.