---
title: "AppExtensionPoint.Error.hostMustDefineAppExtensionPoint(_:)"
framework: extensionfoundation
role: symbol
role_heading: Case
path: "extensionfoundation/appextensionpoint/error/hostmustdefineappextensionpoint(_:)"
---

# AppExtensionPoint.Error.hostMustDefineAppExtensionPoint(_:)

An error that indicates an attempt to define an extension point outside an app.

## Declaration

```swift
case hostMustDefineAppExtensionPoint(String)
```

## See Also

### Getting the error codes

- [AppExtensionPoint.Error.hostMustBeApplicationOrAppExtension](extensionfoundation/appextensionpoint/error/hostmustbeapplicationorappextension.md)
- [AppExtensionPoint.Error.hostMustHaveBundleIdentifier](extensionfoundation/appextensionpoint/error/hostmusthavebundleidentifier.md)
- [AppExtensionPoint.Error.invalidAppExtensionPoint](extensionfoundation/appextensionpoint/error/invalidappextensionpoint.md)
- [AppExtensionPoint.Error.unspecifiedAppExtensionPointName](extensionfoundation/appextensionpoint/error/unspecifiedappextensionpointname.md)