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Xcode complains link error: "Undefine symbol: '_OBJC_CLASS_$_SKAdImpression'" after pod GoogleMobileAdsMediationAdColony

I’m trying to add AdColony mediation into AdMob.
I follow the instructions from ‘https://developers.google.com/admob/ios/mediation/adcolony‘.

After pod ‘GoogleMobileAdsMediationAdColony’, I open Xcode to test my app and get a link error:

Undefine symbol: '_OBJC_CLASS_$_SKAdImpression'

as well as a warning:

Could not find or use auto-linked framework 'AVFAudio'

I googled but got nothing.

Any suggestion? Thanks in advance.

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2

Answers


  1. 0

    SKAdImpression looks like a class that is new to iOS 14.5 so you likely need Xcode 12.5+ to contain that class definition.

    I was running into the same Undefined symbol: ‘OBJC_CLASS$_SKAdImpression’ error under Xcode 12.4, but upgrading to 12.5 fixed for me.

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  2. 0

    Version 4.6.1 of the iOS AdColony SDK requires Xcode 12.5.

    From the changelog:

    4.6.1 (2021/04/21)

    • SKAdNetwork view-through attribution support
    • Build requires Xcode 12.5

    This does mean that if you go back to 4.6.0 you should not need Xcode 12.5. You can do this by selecting a specific version of the ‘GoogleMobileAdsMediationAdColony’ pod:

    pod 'GoogleMobileAdsMediationAdColony', '4.6.0.0'

    You can see in the podspec here that this version uses version 4.6.0 of the AdColony SDK.

    Obviously this is not a long-term solution, but as Xcode 12.5 requires Big Sur it allows a little more time before having to run an major OS update all your dev machines.

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