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# assetListResponseStatusDidChangeErrorKey

A key to retrieve the error related to a change in an interstitial event’s asset list response.

```
class let assetListResponseStatusDidChangeErrorKey: String
```

## Discussion

This key only exists in the notification’s <doc://com.apple.documentation/documentation/Foundation/Notification/userInfo> dictionary when the status is [`AVPlayerInterstitialEventAssetListResponseStatus.unavailable`](/documentation/AVFoundation/AVPlayerInterstitialEventAssetListResponseStatus/unavailable). Use it to retrieve an error object that provides information about the failure to read the asset list.

---

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