---
title: NSUncaughtRuntimeErrorException
framework: Exception Handling
role: symbol
role_heading: Global Variable
platforms: [Mac Catalyst 13.0+, macOS 10.0+]
path: exceptionhandling/nsuncaughtruntimeerrorexception
---

# NSUncaughtRuntimeErrorException

Identifies an Objective-C runtime error.

## Declaration

```swift
let NSUncaughtRuntimeErrorException: String
```

## See Also

### Constants

- [NSStackTraceKey](exceptionhandling/nsstacktracekey.md)
- [NSUncaughtSystemExceptionException](exceptionhandling/nsuncaughtsystemexceptionexception.md)