# CLIENT999: Unexpected error

## What this means[​](#what-this-means "What this means으로 직접 링크")

WCPOS encountered an unexpected error.

Try the action once more, then export diagnostics and contact support if it fails again.

## What to do[​](#what-to-do "What to do으로 직접 링크")

Export diagnostics and contact support. WCPOS does not retry this by itself — retry when you are ready.

## Your data[​](#your-data "Your data으로 직접 링크")

The outcome could not be confirmed — verify before retrying. If this persists, export diagnostics and contact WCPOS support.

## Details[​](#details "Details으로 직접 링크")

* **Code:** `CLIENT999` (`UNEXPECTED_ERROR`)
* **Severity:** error
* **Introduced in:** WCPOS 1.10.0