# 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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.movebot.io/troubleshooting/errors-and-failures/common-errors/error-invalid-filename-characters.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.