# ri > I18n::MissingInterpolationArgument

---
type: CommandReference
command: I18n::MissingInterpolationArgument
mode: ri
section: 
source: rdoc
---

## Quick Reference

- `I18n::MissingInterpolationArgument.new(key, string, values)` — Create a new instance
- `#key` — Returns the missing key
- `#string` — Returns the interpolation string
- `#values` — Returns the provided values

## Name

I18n::MissingInterpolationArgument — Exception raised when a required interpolation argument is missing.

## Synopsis

ruby
I18n::MissingInterpolationArgument.new(key, string, values)
## Methods

### Class methods

- `new(key, string, values)` — Constructor

### Instance methods

- `key` — Returns the missing key
- `string` — Returns the interpolation string
- `values` — Returns the provided values

## Attributes

- `attr_reader :key`
- `attr_reader :string`
- `attr_reader :values`

## See Also

- [I18n::ArgumentError](http://localhost/phpMan.php/perldoc/I18n%3A%3AArgumentError/markdown)