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java.lang.UnsupportedOperationException: empty.max at scala.collection.TraversableOnce$class.max(TraversableOnce.scala:216) at scala.collection.AbstractTraversable.max(Traversable.scala:105) at scopt.OptionParser.renderTwoColumnsUsage(options.scala:297) at scopt.OptionParser.renderUsage(options.scala:284) at scopt.OptionParser.usage(options.scala:280)