# `Calendrical.UnknownOptionError`

Exception raised by a calendar maker (`use Calendrical.Calendar` and the
others), and returned by `Calendrical.new/3` and
`Calendrical.Composite.new/2`, for options the maker does not read.

### Fields

* `:maker` — the maker the options were given to, such as
  `Calendrical.Calendar.Weeks`.

* `:options` — the options it does not read.

* `:known_options` — the options it reads.

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