> ## 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.

# Unprocessable Entity

> The request is well-formed but contains semantic errors

## Cause

The request is syntactically correct but contains semantic errors that prevent processing.

## Fix

Review the request data for logical errors and ensure all business rules are satisfied, then call the same operation again.

## Retry safety

Not retryable until the underlying state or request changes.

## Raised by

Many operations return this problem. Check the error responses on the operation you called.

Examples:

* [Create an appointment](/api-reference/appointments/create-an-appointment)
* [Patch an appointment](/api-reference/appointments/patch-an-appointment)
* [Authorize an appointment payment](/api-reference/appointments/authorize-an-appointment-payment)
* [Create a contactless payment](/api-reference/payments/create-a-contactless-payment)
* [List appointment payments](/api-reference/appointments/list-appointment-payments)

## Example

```json theme={null}
{
  "type": "https://docs.guile.app/problems/unprocessableEntity",
  "title": "Unprocessable Entity",
  "status": 422,
  "detail": "The request is syntactically correct but contains semantic errors that prevent processing."
}
```