# SYNC999: Sync unexpected

## What this means[​](#what-this-means "直接链接到 What this means")

Syncing hit an unexpected problem.

Your sales are safe on this device. Wait for the automatic retry; if this code keeps appearing, export diagnostics and contact support.

## What to do[​](#what-to-do "直接链接到 What to do")

Try the action again. WCPOS retries this automatically.

## Your data[​](#your-data "直接链接到 Your data")

The change is saved on this device but has not reached your store. If this persists, export diagnostics and contact WCPOS support.

## Details[​](#details "直接链接到 Details")

* **Code:** `SYNC999` (`SYNC_UNEXPECTED`)
* **Severity:** error
* **Introduced in:** WCPOS 1.10.0