---
title: NSOperationNotSupportedForKeySpecifierError
framework: foundation
role: symbol
role_heading: Global Variable
path: foundation/nsoperationnotsupportedforkeyspecifiererror
---

# NSOperationNotSupportedForKeySpecifierError

Attempt made to perform an unsupported operation on some key.

## Declaration

```swift
var NSOperationNotSupportedForKeySpecifierError: Int { get }
```

## See Also

### Constants

- [NSNoSpecifierError](foundation/nsnospecifiererror.md)
- [NSNoTopLevelContainersSpecifierError](foundation/nsnotoplevelcontainersspecifiererror.md)
- [NSContainerSpecifierError](foundation/nscontainerspecifiererror.md)
- [NSUnknownKeySpecifierError](foundation/nsunknownkeyspecifiererror.md)
- [NSInvalidIndexSpecifierError](foundation/nsinvalidindexspecifiererror.md)
- [NSInternalSpecifierError](foundation/nsinternalspecifiererror.md)