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java.lang.IllegalAccessError: already closed	at org.mapdb.EngineWrapper$1.get(EngineWrapper.java:472)	at org.mapdb.EngineWrapper.get(EngineWrapper.java:58)	at org.mapdb.BTreeMap.get(BTreeMap.java:595)	at org.mapdb.BTreeMap.get(BTreeMap.java:589)	at services.UpdatesService$.fetchNotifications(UpdatesService.scala:260)	at services.UpdatesService$.fetchUpdates(UpdatesService.scala:226)	at controllers.Messaging$$anonfun$updates$1$$anonfun$15.apply(Messaging.scala:90)	at controllers.Messaging$$anonfun$updates$1$$anonfun$15.apply(Messaging.scala:90)	at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)	at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)	at scala.concurrent.impl.ExecutionContextImpl$$anon$3.exec(ExecutionContextImpl.scala:107)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)