# CLIENT101: App start failed

## What this means[​](#what-this-means "Direct link to What this means")

WCPOS could not finish starting.

Restart once, then export diagnostics with the app version and device engine if startup still fails.

## What to do[​](#what-to-do "Direct link to What to do")

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

## Your data[​](#your-data "Direct link to 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 "Direct link to Details")

* **Code:** `CLIENT101` (`APP_START_FAILED`)
* **Severity:** error
* **Introduced in:** WCPOS 1.10.0