# subject_required

**HTTP status:** 422 (Unprocessable)

**Title:** Subject required

## Cause

The first email of a case needs a subject.

## How to fix it

Read `detail` in the response: it says what to change. Do not retry the same request unchanged.

Every error carries `requestId` and the `Request-Id` header. Send it when you write to support.

[All error codes](/errors)