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java.lang.IllegalArgumentException: requirement failed	at scala.Predef$.require(Predef.scala:207)	at scala.concurrent.BatchingExecutor$Batch.run(BatchingExecutor.scala:51)	at scala.concurrent.Future$InternalCallbackExecutor$.unbatchedExecute(Future.scala:599)	at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:72)	at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:78)	at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:55)	at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:55)	at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)	at scala.concurrent.BatchingExecutor$Batch.run(BatchingExecutor.scala:54)	at scala.concurrent.Future$InternalCallbackExecutor$.unbatchedExecute(Future.scala:599)	at scala.concurrent.BatchingExecutor$class.execute(BatchingExecutor.scala:106)	at scala.concurrent.Future$InternalCallbackExecutor$.execute(Future.scala:597)	at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40)	at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248)	at scala.concurrent.Promise$class.complete(Promise.scala:55)	at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153)	at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)	at scala.concurrent.Future$$anonfun$map$1.apply(Future.scala:235)	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)	at scala.concurrent.impl.ExecutionContextImpl$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)