---
title: WKWebExtension.MessagePort.Error
framework: webkit
role: symbol
role_heading: Structure
path: webkit/wkwebextension/messageport/error
---

# WKWebExtension.MessagePort.Error

Constants that indicate errors in the WKWebExtension.MessagePort domain.

## Declaration

```swift
struct Error
```

## Topics

### Type Properties

- [errorDomain](webkit/wkwebextension/messageport/error/errordomain.md)
- [messageInvalid](webkit/wkwebextension/messageport/error/messageinvalid.md)
- [notConnected](webkit/wkwebextension/messageport/error/notconnected.md)
- [unknown](webkit/wkwebextension/messageport/error/unknown.md)

## Relationships

### Conforms To

- [CustomNSError](foundation/customnserror.md)
- [Equatable](swift/equatable.md)
- [Error](swift/error.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)