---
title: NSScriptObjectSpecifier—Specifier Evaluation Errors
framework: foundation
role: collectionGroup
role_heading: API Collection
path: foundation/specifier-evaluation-errors
---

# NSScriptObjectSpecifier—Specifier Evaluation Errors

NSScriptObjectSpecifier provides the following constants for error codes for specific problems evaluating specifiers:

## Topics

### 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)
- [NSOperationNotSupportedForKeySpecifierError](foundation/nsoperationnotsupportedforkeyspecifiererror.md)