---
title: LanguageModelSession.Error
framework: foundationmodels
role: symbol
role_heading: Enumeration
path: foundationmodels/languagemodelsession/error
---

# LanguageModelSession.Error

A failure caused by incorrect use of a language model session.

## Declaration

```swift
enum Error
```

## Topics

### Getting the session errors

- [LanguageModelSession.Error.concurrentRequests](foundationmodels/languagemodelsession/error/concurrentrequests.md)
- [LanguageModelSession.Error.transcriptMutationWhileResponding](foundationmodels/languagemodelsession/error/transcriptmutationwhileresponding.md)

## Relationships

### Conforms To

- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Error](swift/error.md)
- [Escapable](swift/escapable.md)
- [Hashable](swift/hashable.md)
- [LocalizedError](foundation/localizederror.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Errors

- [LanguageModelSession.ToolCallError](foundationmodels/languagemodelsession/toolcallerror.md)
- [LanguageModelSession.GenerationError](foundationmodels/languagemodelsession/generationerror.md)