# `configuration.binding_empty`

Setting names an empty environment variable.

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: ""
    }
}
```

```text
error: `binding:` names no variable
 --> main.jadpo:3:18
  |
3 |         binding: ""
  |                  ^^ empty
  reason: `binding:` names the environment variable a setting is read from; an empty name reads nothing.
  next: Name the variable, or leave `binding:` out to read the setting's name in capitals (agent)
  rule: configuration.binding_empty
  help: https://jadpo.dev/docs/errors/configuration.binding_empty

check failed: 1 error, 1 file
```