# API05003: WCPOS Plugin Outdated

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

The WCPOS plugin installed on your server is outdated and not compatible with your version of the POS application. You need to update the plugin.

## Common Causes[​](#common-causes "Direct link to Common Causes")

* **Plugin not updated** — Auto-updates may be disabled
* **Update failed** — A previous update attempt failed
* **Version mismatch** — POS app updated but plugin wasn't
* **Staging/dev site** — Testing on an older version

## How to Fix[​](#how-to-fix "Direct link to How to Fix")

### 1. Update the Plugin[​](#1-update-the-plugin "Direct link to 1. Update the Plugin")

In WordPress Admin:

1. Go to Plugins → Installed Plugins
2. Find "WooCommerce POS"
3. If an update is available, click "Update Now"

### 2. Enable Auto-Updates[​](#2-enable-auto-updates "Direct link to 2. Enable Auto-Updates")

To prevent future mismatches:

1. Go to Plugins → Installed Plugins
2. Find "WooCommerce POS"
3. Click "Enable auto-updates"

### 3. Manual Update[​](#3-manual-update "Direct link to 3. Manual Update")

If automatic update fails:

1. Download the latest version from [WordPress.org](https://wordpress.org/plugins/woocommerce-pos/)
2. Deactivate the current plugin
3. Delete the old plugin files
4. Upload and activate the new version

### 4. Check for Update Errors[​](#4-check-for-update-errors "Direct link to 4. Check for Update Errors")

If updates are failing:

* Check file permissions on wp-content/plugins
* Verify you have disk space
* Look for PHP memory issues
* Check error logs for details

### 5. Downgrade POS App (Temporary)[​](#5-downgrade-pos-app-temporary "Direct link to 5. Downgrade POS App (Temporary)")

If you can't update the plugin immediately:

* Use an older version of the POS app
* This is a temporary workaround only
* Plan to update the plugin soon

## Version Compatibility[​](#version-compatibility "Direct link to Version Compatibility")

Always keep both components updated:

* The POS application
* The WCPOS WordPress plugin

Check release notes for any breaking changes when updating.

## Related Errors[​](#related-errors "Direct link to Related Errors")

* [API05002](/error-codes/API05002.md) — WCPOS Plugin Not Found
* [API05005](/error-codes/API05005.md) — Plugin Not Found