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java.util.NoSuchElementException: next on empty iterator	at scala.collection.Iterator$$anon$2.next(Iterator.scala:39)	at scala.collection.Iterator$$anon$2.next(Iterator.scala:37)	at scala.collection.IndexedSeqLike$Elements.next(IndexedSeqLike.scala:63)	at scala.collection.IterableLike$class.head(IterableLike.scala:107)	at scala.collection.immutable.StringOps.scala$collection$IndexedSeqOptimized$$super$head(StringOps.scala:30)	at scala.collection.IndexedSeqOptimized$class.head(IndexedSeqOptimized.scala:126)	at scala.collection.immutable.StringOps.head(StringOps.scala:30)	at undefined.$anon$1$$anonfun$run$1.apply(:23)	at undefined.$anon$1$$anonfun$run$1.apply(:23)	at scala.collection.TraversableLike$$anonfun$groupBy$1.apply(TraversableLike.scala:332)	at scala.collection.TraversableLike$$anonfun$groupBy$1.apply(TraversableLike.scala:331)	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)	at scala.collection.TraversableLike$class.groupBy(TraversableLike.scala:331)	at scala.collection.mutable.ArrayOps$ofRef.groupBy(ArrayOps.scala:186)	at undefined.$anon$1.run(:23)	at Helper.HasRun$class.newRun(HasRun.scala:21)	at undefined.$anon$1.newRun(:19)