Undefined symbols SKAdImpression

Unity: All versions | Appodeal SDK: All versions

The error Undefined symbols for architecture arm64: "\_OBJC_CLASS\_$\_SKAdImpression" during the iOS build usually happens if XCode or CocoaPods version is lower than required.

The error log example:

ld: warning: Could not find or use auto-linked framework 'SmaatoSDKUnifiedBidding'
ld: warning: Could not find or use auto-linked framework 'AVFAudio'
ld: warning: Could not find or use auto-linked framework 'AppodealMediationCoreObjC'
Undefined symbols for architecture arm64:
"_OBJC_CLASS_$_SKAdImpression", referenced from:
objc-class-ref in AdColony(ADCAdSession.o)
objc-class-ref in MyTargetSDK(MTRGCommonBannerParser.o)
(maybe you meant: _OBJC_CLASS_$_SKAdImpressionProxy)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

To fix it use the versions listed in the Minimum OS requirements section:

UPM
Manual

info

Unity 2019.4+, 2020.3.16+, 2021.1.17+
Android API level 21 (Android OS 5.0) and above
iOS 12.0 or higher
Use XCode 14 or higher
CocoaPods 1.10.0 or higher
Git must be installed on your device

To update CocoaPods to the latest version, open Terminal and perform the following command:

sudo gem install cocoapods