Why is a comma in a function forcing a "Function not found" Erro

Question

The comma in the third call of COMMENT forces and error - escaping doesn't work - removing does ??

@startuml
!define COMMENT(x) <b><color:grey>x</color></b>

class LPConversationHistoryControlParam <<NSObject>> {
  var historyConversationsStateToDisplay: LPConversationsHistoryStateToDisplay 
  COMMENT( control what kind of conversation to show Open or Close)
  var historyConversationsMaxDays: Int 
  COMMENT( get conversation that Closed or Opens in the last X days)
  var isEnable: Bool 
  COMMENT( whether filtering by open or close, or filtering by historyConversationsMaxDays )
  var historyConversationMaxDaysType: LPConversationHistoryMaxDaysDateType? 
  COMMENT( Control if filter the max days by conversation start date or by conversation close date )
}
@enduml

Answer 1

This is because the comma is used as separator for argument.

You can use quotes in that case:

http://www.plantuml.com/plantuml/uml/VL9DJy904BttLpmvIMB2lMag4KWqaOy43bwtxPIkBZjaTuGsnlzkMogXQ3ZklhVlOsV6NfIJpvq9xZBAjILCblFvRB6vBuU8aZXAsR0Bjuwgk8n6xIcEHaaS1AbHtkDrDM5x8EULQBRFsWkxghuInsQbdDeXYXRhPV9EgSGnlWBWe1oAC_7yrgz52MrugltUg2gyalQTTf-50EV4I4-sE1PAyA5j1iwHNcX06BxW8vPxic27YM5FmnkPvggSgig7UB7IyzgIN4atfgrURUjQ1m_Tt1ECye8tPBNIhvdsCwiIGo6UcCsbzE1OKFt88TT6o6cxHLA1kyHfu_00xiEtiWzkzEiecsfFuV-Zx1XJ9TIm7dkVqCqPEk_Ij6rtgcohrhdwNzJkMWq9WTqVj6rsGeV1Tp0cczLx-GC0

Hope this helps!