# `Tempo.IntervalEndpointsError`
[🔗](https://github.com/kipcole9/tempo/blob/v0.20.0/lib/tempo/exception/interval_endpoints_error.ex#L1)

Exception raised when an operation requires an interval whose
endpoints are both concrete `%Tempo{}` structs, but the
supplied interval carries recurrence, duration-only, or
otherwise non-concrete endpoints.

Materialise the interval with `Tempo.to_interval/1,2` first.

# `t`

```elixir
@type t() :: %Tempo.IntervalEndpointsError{
  __exception__: term(),
  interval: Tempo.Interval.t() | nil,
  operation: atom() | String.t() | nil,
  reason: atom() | String.t() | nil
}
```

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