> For the complete documentation index, see [llms.txt](https://wallee.gitbook.io/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages.md).

# Error Messages

- [Why is the order status not synchronized with Lightspeed?](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages/why-is-the-order-status-not-synchronized-with-lightspeed.md)
- [Why is a '404 Page Not Found' shown in my shop instead of redirecting to the checkout page?](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages/why-is-a-404-page-not-found-shown-in-my-shop-instead-of-redirecting-to-the-checkout-page.md)
- [How to fix the 'Internal Server Error' message that appears in a popup when selecting the TWINT](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages/how-to-fix-the-internal-server-error-message-that-appears-in-a-popup-when-selecting-the-twint.md)
- [How to debug and fix a timeout issue when redirecting to the shop after transaction is processed?](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages/how-to-debug-and-fix-a-timeout-issue-when-redirecting-to-the-shop-after-transaction-is-processed.md)
- [How to fix a permission issue occurring in your shop backend with error 'Permission Denied'?](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages/how-to-fix-a-permission-issue-occurring-in-your-shop-backend-with-error-permission-denied.md)
- [How can I track a failed transaction in PrestaShop and disable notifications?](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages/how-can-i-track-a-failed-transaction-in-prestashop-and-disable-notifications.md)
- [What does 'Webhook call failed' mean and how can it be fixed?"](https://wallee.gitbook.io/documentation/faq/e-commerce-troubleshooting-and-handling/error-messages/what-does-webhook-call-failed-mean-and-how-can-it-be-fixed.md)