java.util.NoSuchElementException: head of empty list

qiita.com | 5 months ago
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    Root Cause Analysis

    1. java.util.NoSuchElementException

      head of empty list

      at scala.collection.immutable.Nil$.head()
    2. Scala
      Stack.pop
      1. scala.collection.immutable.Nil$.head(List.scala:420)
      2. scala.collection.immutable.Nil$.head(List.scala:417)
      3. scala.collection.mutable.Stack.pop(Stack.scala:140)
      3 frames