Month aJewishMonth does not exist for Jewish year aJewishYear
This message will usually come from the use of the EncodeJewishDate Macro function. In the Jewishcalendar, on leap years, the month of Adar ir replaced by 2 months named Adar I and Adar II. On non-leap years, these 2 months do not exist, while on leap years, the month of Adar does not exist. For more details, see Jewish Month Numbers.