---
title: authenticationError
framework: system
role: symbol
role_heading: Type Property
path: system/errno/authenticationerror
---

# authenticationError

Authentication error.

## Declaration

```swift
static var authenticationError: Errno { get }
```

## Mentioned in

Adopting Swift Error Constants

## Discussion

Discussion The authentication ticket used to mount an NFS file system was invalid. The corresponding C error is EAUTH.

## See Also

### NFS Errors

- [needAuthenticator](system/errno/needauthenticator.md)
- [staleNFSFileHandle](system/errno/stalenfsfilehandle.md)