scala.MatchError: (List(),(a,1)) (of class scala.Tuple2)

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    Root Cause Analysis

    1. scala.MatchError

      (List(),(a,1)) (of class scala.Tuple2)

      at forcomp.A$A183$A$A183$$anonfun$subtract2$1.apply()
    2. forcomp
      1. forcomp.A$A183$A$A183$$anonfun$subtract2$1.apply(
      2. forcomp.A$A183$A$A183$$anonfun$subtract2$1.apply(
      2 frames
    3. Scala
      1. scala.collection.LinearSeqOptimized$class.foldLeft(
      2. scala.collection.immutable.List.foldLeft(
      2 frames
    4. forcomp
      1. forcomp.A$A183$A$A183.subtract2(
      1 frame