# E04062 — EmailTemplateParameterMissing

The send does not supply a value for every parameter the template uses.

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

## What to do

Read the template to see the parameters it declares, then supply a value for each one. A parameter with no value would render as a blank in the delivered message, so the send is refused instead.

## 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`