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# SKAdTestError.Code.invalidRunnerUpPostback

A non-winning postback is defined with a version prior to version 3, in the testing environment.

```
case invalidRunnerUpPostback
```

## Discussion

Check that all non-winning postback you create with [`init(version:adNetworkIdentifier:adCampaignIdentifier:appStoreItemIdentifier:sourceAppStoreItemIdentifier:conversionValue:fidelityType:isRedownload:didWin:postbackURL:)`](/documentation/StoreKitTest/SKAdTestPostback/init(version:adNetworkIdentifier:adCampaignIdentifier:appStoreItemIdentifier:sourceAppStoreItemIdentifier:conversionValue:fidelityType:isRedownload:didWin:postbackURL:)) in [`SKAdTestPostback`](/documentation/StoreKitTest/SKAdTestPostback) specify version 3 ([`version3_0`](/documentation/StoreKitTest/SKAdTestPostbackVersion/version3_0)) or later. Non-winning postbacks are available starting in version 3. For more information about versions, see <doc://com.apple.documentation/documentation/StoreKit/skadnetwork-release-notes>.

---

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