---
title: installationError
framework: marketplacekit
role: symbol
role_heading: Instance Property
path: marketplacekit/applibrary/app/installationerror
---

# installationError

An error that occurs during the installation of an app that resides on a marketplace.

## Declaration

```swift
@MainActor final var installationError: MarketplaceKitError? { get }
```

## See Also

### Inspecting app installation and update status

- [installation](marketplacekit/applibrary/app/installation-swift.property.md)
- [AppLibrary.App.Installation](marketplacekit/applibrary/app/installation-swift.struct.md)
- [isInstalled](marketplacekit/applibrary/app/isinstalled.md)
- [isInstalling](marketplacekit/applibrary/app/isinstalling.md)
- [isUpdating](marketplacekit/applibrary/app/isupdating.md)