--- 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' --- ExpandOn this page * [Extension QR code doesn't work on Android](https://shopify.dev/docs/apps/build/pos/troubleshooting.md#extension-qr-code-doesnt-work-on-android) * [Package resolution failed](https://shopify.dev/docs/apps/build/pos/troubleshooting.md#package-resolution-failed) # 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. ``` *** * [Extension QR code doesn't work on Android](https://shopify.dev/docs/apps/build/pos/troubleshooting.md#extension-qr-code-doesnt-work-on-android) * [Package resolution failed](https://shopify.dev/docs/apps/build/pos/troubleshooting.md#package-resolution-failed)