> For the complete documentation index, see [llms.txt](https://docs.movebot.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.movebot.io/troubleshooting/errors-and-failures/common-errors/error-invalid-filename-characters.md).

# Error: invalid-filename-characters

|                |                             |
| -------------- | --------------------------- |
| Error Type     | invalid-filename-characters |
| Relevant Store | All                         |

## Description

Invalid Filename Character errors are due to having an invalid name for a file.

{% hint style="info" %}
During the scan stage of migration (the first step), Movebot will perform checks to ensure your data will transfer properly. One of these checks is the names of files - there is a chance some of your files have invalid names
{% endhint %}

## Common Root Causes

* The file has an invalid name for the store that it is being uploaded into

## Quick Fixes

* Add a filename transformation rule to modify the names of the files during the transfer
  * This is found under Project Settings -> Content Options
  * This cannot be done for email/contacts/calendars, only for files
* Change the name of the affected files manually in the source.

After attempting a fix, rerun failures or run a new delta migration to see if the error is resolved.