# BRANCH_NOT_WRITABLE: Branch is not writable

> The ref you wrote to is a tag, or an environment that serves one, and tags never change.

Sent by the management API (400). The page: https://coho-cms.com/errors/branch-not-writable/

## What to do

Write to a branch. To change released content, branch from the tag, write there, and tag again.

## The response

```json
{
  "code": "BRANCH_NOT_WRITABLE",
  "type": "https://coho-cms.com/errors/branch-not-writable",
  "title": "Branch is not writable",
  "status": 400,
  "detail": "What went wrong in this request, in a sentence.",
  "instance": "/v1/projects/…"
}
```

Every error code: https://coho-cms.com/errors/