Error: Error: System.ArgumentNullException: Value cannot be null.
Parameter name: values
at System.String.Join[T](String separator, IEnumerable`1 values)
at blEvents.createEventDetails_Monthly(RecurringEventItem& recurringEvent)
at blEvents.convertSingleJsonToEventList(RecurringEventItem recurringEvent, Boolean _getEventLocation, Boolean _getContactInfo)
at blEvents.selectEvent_byId(Int32 _eventId, Boolean _getEventLocation, Boolean _getContactInfo)