---
description: Troubleshoot Cloudflare error 10056.
title: Error 10056
image: https://developers.cloudflare.com/og-docs.png
---

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# Error 10056

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/support/troubleshooting/http-status-codes/cloudflare-10xxx-errors/error-10056/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

## Error 10056: The add list items operation contains different types of list items

This error indicates that different types of list items were combined in a single add operation.

### Common causes

This error occurs when different types of list items (such as IP addresses, hostnames, and URL redirects) are included in a single operation to add items to a list. It can occur with an IP list, a hostname list, or a Bulk Redirect List.

### Resolution

Remove the list items that do not apply to the list type. This means:

* Removing IP addresses from a request to add items to a Bulk Redirect List.
* Removing URL redirects from a request to add items to an IP list.

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