---
title: CGImageMetadataErrors.unknown
framework: imageio
role: symbol
role_heading: Case
path: imageio/cgimagemetadataerrors/unknown
---

# CGImageMetadataErrors.unknown

An error that indicates an unknown condition occurred.

## Declaration

```swift
case unknown
```

## See Also

### Error Codes

- [CGImageMetadataErrors.unsupportedFormat](imageio/cgimagemetadataerrors/unsupportedformat.md)
- [CGImageMetadataErrors.badArgument](imageio/cgimagemetadataerrors/badargument.md)
- [CGImageMetadataErrors.conflictingArguments](imageio/cgimagemetadataerrors/conflictingarguments.md)
- [CGImageMetadataErrors.prefixConflict](imageio/cgimagemetadataerrors/prefixconflict.md)