# `Calendrical.InvalidMonthError`

Exception returned when a month is one a calendar, or a year of it,
does not have.

### Fields

* `:calendar` — the calendar module that was asked.

* `:year` — the year that was asked for the month, or `nil` when the
  question had no year.

* `:month` — the month as it was given: an ordinal month, or a
  traditional month such as `{2, :leap}`.

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*Consult [api-reference.md](api-reference.md) for complete listing*