# E04061 — EmailTemplateVariableInvalid

The content references a parameter whose name is not a single word.

- **HTTP status**: `422`
- **Type**: `validation_error`
- **Name**: `EmailTemplateVariableInvalid`

## What to do

A parameter is a single word, such as `{{ animal }}`, and the send supplies its value. A dotted name reaches for a structure a parameter does not have; write the value as its own parameter, or read contact data with `bird.contact.<attribute>`.

## Related

- [E04xxx — Email sending & delivery](/docs/api/errors/E04xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`