---
title: WKExtendedRuntimeSessionErrorDomain
framework: watchkit
role: symbol
role_heading: Global Variable
path: watchkit/wkextendedruntimesessionerrordomain
---

# WKExtendedRuntimeSessionErrorDomain

The domain for errors reported by extended runtime sessions.

## Declaration

```swift
let WKExtendedRuntimeSessionErrorDomain: String
```

## Discussion

Discussion The session passes these errors to the session delegate’s extendedRuntimeSession(_:didInvalidateWith:error:) method.

## See Also

### Handling Errors

- [WKExtendedRuntimeSessionErrorCode](watchkit/wkextendedruntimesessionerrorcode.md)