> For the complete documentation index, see [llms.txt](https://faq.wanttopay.net/wanttopay-app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faq.wanttopay.net/wanttopay-app/english/oshibki-i-resheniya/oshibki-v-mini-prilozhenii.md).

# Mini App Errors

<details>

<summary>User registration error (Error code: #U001)</summary>

**Possible causes**

This error occurs if you try to register with a phone number or email address that has already been used before.

The system does not allow creating a second account with the same contact details.

**What should you do?**

If you see this error, you have most likely already registered.

Contact support via [@WantToPaySupportBot](https://telegram.me/WantToPaySupportBot), we will check the details and tell you what to do next.

</details>

<details>

<summary>401 Unauthorized when logging into the mini app (Error code: #U002)</summary>

**What should you do?**\
The active app session lasts 15 minutes. After this time, the connection will be interrupted, which will cause the error. To log in again, tap «Menu» → «Open app» → «Log in». If that does not help, restart [@WantToPayBot](https://telegram.me/WantToPayBot?start=w17851188--luMLI) with the /start command and try again.

</details>

<details>

<summary>White screen or 401 error when logging into the mini app (Error code: #U003)</summary>

**What should you do?**\
Special characters in the «First name», «Last name», «Username», and Bio fields in Telegram may interfere with logging into the app. Try removing them and try again.

</details>

<details>

<summary>White screen when logging into the app via Telegram Desktop (Error code: #U004)</summary>

**What should you do?**\
To log in to [the mini app](https://telegram.me/WantToPayBot?start=w17851188--luMLI) use mobile Telegram — for some providers, logging in through the desktop version may not work; login may not work for some providers. If the issue could not be resolved, contact [support](https://telegram.me/wanttopaysupportbot)**.**

</details>

<details>

<summary>500 Server Error when logging into the mini app (Error code: #U005)</summary>

**What should you do?**\
For proper operation, make sure you have the latest version of Telegram installed. If the issue could not be resolved, contact [support](https://telegram.me/wanttopaysupportbot)**.**

</details>


---

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