# `configuration.duplicate_option`

Setting option is given twice.

Area 10, [Configuration and time](../topics/configuration-and-time.md); not declinable; the next step is usually the agent's.

```jadpo
config {
    mail_sender: Email {
        binding: "MAIL_SENDER"
        binding: "SENDER"
    }
}
```

```text
error: `binding:` is given twice on `mail_sender`
 --> main.jadpo:4:9
  |
3 |         binding: "MAIL_SENDER"
  |         ------- first given here
4 |         binding: "SENDER"
  |         ^^^^^^^ given again
  reason: A setting says each of `secret:`, `default:`, `binding:` and `test:` once, so there is one answer to read.
  next: Remove one `binding:` (agent)
  rule: configuration.duplicate_option
  help: https://jadpo.dev/docs/errors/configuration.duplicate_option

check failed: 1 error, 1 file
```