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# WKWebExtension.MatchPattern.Error

Constants that indicate errors in the [`WKWebExtension.MatchPattern`](/documentation/WebKit/WKWebExtension/MatchPattern) domain.

```
struct Error
```

## Topics

### Type Properties

[`static var errorDomain: String`](/documentation/WebKit/WKWebExtension/MatchPattern/Error/errorDomain)

[`static var invalidHost: WKWebExtension.MatchPattern.Error.Code`](/documentation/WebKit/WKWebExtension/MatchPattern/Error/invalidHost)

Indicates that the host component was invalid.

[`static var invalidPath: WKWebExtension.MatchPattern.Error.Code`](/documentation/WebKit/WKWebExtension/MatchPattern/Error/invalidPath)

Indicates that the path component was invalid.

[`static var invalidScheme: WKWebExtension.MatchPattern.Error.Code`](/documentation/WebKit/WKWebExtension/MatchPattern/Error/invalidScheme)

Indicates that the scheme component was invalid.

[`static var unknown: WKWebExtension.MatchPattern.Error.Code`](/documentation/WebKit/WKWebExtension/MatchPattern/Error/unknown)

Indicates that an unknown error occurred.

## Relationships

### Conforms To

[`Hashable`](/documentation/Swift/Hashable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`CustomNSError`](/documentation/Foundation/CustomNSError)

[`Error`](/documentation/Swift/Error)

[`Sendable`](/documentation/Swift/Sendable)

[`Equatable`](/documentation/Swift/Equatable)

---

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