---
title: WKWebExtensionContext.Error
framework: webkit
role: symbol
role_heading: Structure
path: webkit/wkwebextensioncontext/error
---

# WKWebExtensionContext.Error

Constants used to indicate errors in the web extension context domain.

## Declaration

```swift
struct Error
```

## Topics

### Type Properties

- [alreadyLoaded](webkit/wkwebextensioncontext/error/alreadyloaded.md)
- [backgroundContentFailedToLoad](webkit/wkwebextensioncontext/error/backgroundcontentfailedtoload.md)
- [baseURLAlreadyInUse](webkit/wkwebextensioncontext/error/baseurlalreadyinuse.md)
- [errorDomain](webkit/wkwebextensioncontext/error/errordomain.md)
- [noBackgroundContent](webkit/wkwebextensioncontext/error/nobackgroundcontent.md)
- [notLoaded](webkit/wkwebextensioncontext/error/notloaded.md)
- [unknown](webkit/wkwebextensioncontext/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)

## See Also

### Structures

- [WKWebExtensionContext.NotificationUserInfoKey](webkit/wkwebextensioncontext/notificationuserinfokey.md)