---
title: LanguageModelError
framework: foundationmodels
role: symbol
role_heading: Enumeration
path: foundationmodels/languagemodelerror
---

# LanguageModelError

A failure that may occur while generating a response when using any language model.

## Declaration

```swift
enum LanguageModelError
```

## Mentioned in

Adding server-side intelligence with Private Cloud Compute

## Topics

### Exceeded context size error

- [LanguageModelError.contextSizeExceeded(_:)](foundationmodels/languagemodelerror/contextsizeexceeded(_:).md)
- [LanguageModelError.ContextSizeExceeded](foundationmodels/languagemodelerror/contextsizeexceeded.md)

### Session rate limited error

- [LanguageModelError.rateLimited(_:)](foundationmodels/languagemodelerror/ratelimited(_:).md)
- [LanguageModelError.RateLimited](foundationmodels/languagemodelerror/ratelimited.md)

### Model refusal error

- [LanguageModelError.refusal(_:)](foundationmodels/languagemodelerror/refusal(_:).md)
- [LanguageModelError.Refusal](foundationmodels/languagemodelerror/refusal.md)

### Request timed out error

- [LanguageModelError.timeout(_:)](foundationmodels/languagemodelerror/timeout(_:).md)
- [LanguageModelError.Timeout](foundationmodels/languagemodelerror/timeout.md)

### Safety guardrail error

- [LanguageModelError.guardrailViolation(_:)](foundationmodels/languagemodelerror/guardrailviolation(_:).md)
- [LanguageModelError.GuardrailViolation](foundationmodels/languagemodelerror/guardrailviolation.md)

### Capability unsupported error

- [LanguageModelError.unsupportedCapability(_:)](foundationmodels/languagemodelerror/unsupportedcapability(_:).md)
- [LanguageModelError.UnsupportedCapability](foundationmodels/languagemodelerror/unsupportedcapability.md)

### Transcript content unsupported error

- [LanguageModelError.unsupportedTranscriptContent(_:)](foundationmodels/languagemodelerror/unsupportedtranscriptcontent(_:).md)
- [LanguageModelError.UnsupportedTranscriptContent](foundationmodels/languagemodelerror/unsupportedtranscriptcontent.md)

### Generation guide unsupported error

- [LanguageModelError.unsupportedGenerationGuide(_:)](foundationmodels/languagemodelerror/unsupportedgenerationguide(_:).md)
- [LanguageModelError.UnsupportedGenerationGuide](foundationmodels/languagemodelerror/unsupportedgenerationguide.md)

### Language unsupported error

- [LanguageModelError.unsupportedLanguageOrLocale(_:)](foundationmodels/languagemodelerror/unsupportedlanguageorlocale(_:).md)
- [LanguageModelError.UnsupportedLanguageOrLocale](foundationmodels/languagemodelerror/unsupportedlanguageorlocale.md)

## Relationships

### Conforms To

- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [Error](swift/error.md)
- [LocalizedError](foundation/localizederror.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### System language model

- [Supporting languages and locales with Foundation Models](foundationmodels/supporting-languages-and-locales-with-foundation-models.md)
- [Categorizing and organizing data with content tags](foundationmodels/categorizing-and-organizing-data-with-content-tags.md)
- [SystemLanguageModel](foundationmodels/systemlanguagemodel.md)