---
title: Troubleshooting
description: >-
  Troubleshooting log for the POS UI extensions package. Listed are some
  possible errors and resolutions to help aid in the event of unexpected error
  messages.
source_url:
  html: 'https://shopify.dev/docs/apps/build/pos/troubleshooting'
  md: 'https://shopify.dev/docs/apps/build/pos/troubleshooting.md'
api_name: pos-ui-extensions
---

# Troubleshooting

Troubleshooting log for the POS UI extensions package. Listed are some possible errors and resolutions to help aid in the event of unexpected error messages.

***

## Extension QR code doesn't work on Android

Android devices can have a restriction on how deep links are handled. To resolve this issue, you can use one of the following options:

1. Connect the device to your computer. Use Android Studio to open your deep link by running the following command: adb shell am start "com.shopify.pos\://pos-ui-extensions?url=

2. Download and use a deep link opener app from Play Store.

### Examples

##### Unable to access

```text
Unable to access "..."


It looks like you don't have access to this store. Contact the store administrator for access.
```

##### Site can't be reached

```text
This site can't be reached


Check if there is a typo in com.shopify.pos.
```

***

## Package resolution failed

This error is most likely from missing a dependency in package.json in the app root. Try re-installing your dependencies and running the app again.

### Example

```text
✘ [ERROR] Could not resolve "@preact/signals"


You can mark the path "@preact/signals" as external to exclude it from the bundle, which will remove this error.
```

***