java.lang.IllegalAccessError: already closed

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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)

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