---
title: ConnectedSpatialEndpointObserver.UnavailableError
framework: spatialpreview
role: symbol
role_heading: Structure
path: spatialpreview/connectedspatialendpointobserver/unavailableerror
---

# ConnectedSpatialEndpointObserver.UnavailableError

An error thrown when accessing the endpoint property while no Mac Virtual Display device is available.

## Declaration

```swift
struct UnavailableError
```

## Relationships

### Conforms To

- [Error](swift/error.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Session state and errors

- [SpatialPreviewSessionState](spatialpreview/spatialpreviewsessionstate.md)
- [SpatialPreviewSessionError](spatialpreview/spatialpreviewsessionerror.md)
- [USDPreviewSession.Error](spatialpreview/usdpreviewsession/error.md)
- [USDPreviewSession.Event](spatialpreview/usdpreviewsession/event.md)