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# WKExtendedRuntimeSessionState.invalid

Either the session has encountered an error, or it has stopped running.

```
case invalid
```

## Discussion

The system passes a [`WKExtendedRuntimeSessionInvalidationReason`](/documentation/WatchKit/WKExtendedRuntimeSessionInvalidationReason) value to the session delegate’s [`extendedRuntimeSession(_:didInvalidateWith:error:)`](/documentation/WatchKit/WKExtendedRuntimeSessionDelegate/extendedRuntimeSession(_:didInvalidateWith:error:)) method. Use this value to determine why the session became invalid.

---

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