---
title: QLThumbnailError
framework: Quick Look Thumbnailing
role: symbol
role_heading: Structure
platforms: [iOS 13.0+, iPadOS 13.0+, Mac Catalyst 13.1+, macOS 10.15+, visionOS 1.0+]
path: quicklookthumbnailing/qlthumbnailerror-swift.struct
---

# QLThumbnailError

Error information that might return when you generate a thumbnail.

## Declaration

```swift
struct QLThumbnailError
```

## Topics

### Error Codes

- [generationFailed](quicklookthumbnailing/qlthumbnailerror-swift.struct/generationfailed.md)
- [noCachedThumbnail](quicklookthumbnailing/qlthumbnailerror-swift.struct/nocachedthumbnail.md)
- [noCloudThumbnail](quicklookthumbnailing/qlthumbnailerror-swift.struct/nocloudthumbnail.md)
- [requestCancelled](quicklookthumbnailing/qlthumbnailerror-swift.struct/requestcancelled.md)
- [requestInvalid](quicklookthumbnailing/qlthumbnailerror-swift.struct/requestinvalid.md)
- [savingToURLFailed](quicklookthumbnailing/qlthumbnailerror-swift.struct/savingtourlfailed.md)
- [QLThumbnailError.Code](quicklookthumbnailing/qlthumbnailerror-swift.struct/code.md)

### Type Properties

- [errorDomain](quicklookthumbnailing/qlthumbnailerror-swift.struct/errordomain.md)

## Relationships

### Conforms To

- [CustomNSError](foundation/customnserror.md)
- [Equatable](swift/equatable.md)
- [Error](swift/error.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Error Information

- [QLThumbnailErrorDomain](quicklookthumbnailing/qlthumbnailerrordomain.md)
- [QLThumbnailError.Code](quicklookthumbnailing/qlthumbnailerror-swift.struct/code.md)