# UNKNOWN_REQUEST_MAPPING

**Kind:** Function

**Source:** [`packages/core/errors/messages.ts`](https://github.com/nestjs/nest/blob/master/packages/core/errors/messages.ts#L253)

**Part of:** [Core](subsystem-packages-core)

## Signature

```ts
function UNKNOWN_REQUEST_MAPPING(metatype: Type)
```

## Parameters

| Name | Type |
|---|---|
| `metatype` | `Type` |