# Siwe Errors

## `Siwe.InvalidMessageFieldError`

Thrown when a field in a SIWE Message is invalid.

### Examples

```ts twoslash
// @noErrors
import { Siwe } from 'ox'

Siwe.createMessage({
  address: '0xA0Cf798816D4b9b9866b5330EEa46a18382f251e',
  chainId: 1.1,
  domain: 'example.com',
  nonce: 'foobarbaz',
  uri: 'https://example.com/path',
  version: '1'
})
// @error: Siwe.InvalidMessageFieldError: Invalid Sign-In with Ethereum message field "chainId".
// @error: - Chain ID must be a EIP-155 chain ID.
// @error: - See https://eips.ethereum.org/EIPS/eip-155
// @error: Provided value: 1.1
```

**Source:** [src/core/Siwe.ts](https://github.com/wevm/ox/blob/main/src/core/Siwe.ts#L513)