---
title: NEURLFilterManager.Error.extensionFailedToLoad
framework: networkextension
role: symbol
role_heading: Case
path: networkextension/neurlfiltermanager/error/extensionfailedtoload
---

# NEURLFilterManager.Error.extensionFailedToLoad

The app extension failed to load.

## Declaration

```swift
case extensionFailedToLoad
```

## See Also

### Extension errors

- [NEURLFilterManager.Error.extensionCancelled](networkextension/neurlfiltermanager/error/extensioncancelled.md)
- [NEURLFilterManager.Error.extensionNotFound](networkextension/neurlfiltermanager/error/extensionnotfound.md)