> ## Documentation Index
> Fetch the complete documentation index at: https://docs.guile.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Invalid Category

> One or more of the specified categories are invalid

## Cause

One or more of the specified categories do not exist or are not valid.

## Fix

Verify that all category identifiers are correct and correspond to existing categories. Use the categories endpoint to retrieve a list of valid categories.

## Retry safety

Not retryable until the underlying state or request changes.

## Raised by

These operations can return this problem:

* [List a barber's services](/api-reference/services/list-a-barber-s-services)
* [List shop services](/api-reference/services/list-shop-services)

## Example

```json theme={null}
{
  "type": "https://docs.guile.app/problems/invalidCategory",
  "title": "Invalid Category",
  "status": 422,
  "detail": "One or more of the specified categories do not exist or are not valid."
}
```