# libtmux:error-feature

- **Package:** libtmux
- **Language:** Common Lisp
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-lisp/blob/c2e5fc4ed3befda21f45dfa5d5868c38fd138311/src/conditions.lisp#L14
- **Public owner:** libtmux
- **Page:** https://libtmux.org/en/lisp/latest/reference/libtmux-error-feature/

```
(error-feature condition)

Primary method: libtmux:unsupported-capability:
(error-feature (condition libtmux:unsupported-capability))

Primary method: libtmux:unsupported-platform:
(error-feature (condition libtmux:unsupported-platform))
```

Return the unsupported capability's keyword identifier. No I/O.

## Methods

### `(error-feature (condition libtmux:unsupported-capability))`

### `(error-feature (condition libtmux:unsupported-platform))`

## Parameters

- `condition` (for `error-feature(condition)`)
- `condition` (`libtmux:unsupported-capability`) (for `Primary method: libtmux:unsupported-capability`)
- `condition` (`libtmux:unsupported-platform`) (for `Primary method: libtmux:unsupported-platform`)

## Guides

Pages that discuss `error-feature`.

- [Explicit operations](/en/lisp/latest/guides/operations/)