AdMob crashes with [GADObjectPrivate changeState:]: unrecognized selector

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You need to add -ObjC to the Other Linker Flags of your application target’s build setting:

  1. Click the blue top-level project icon in XCode
  2. Choose your target and go to Build Settings
  3. Under Other Linker Flags add -ObjC for both Release and Debug

Source: https://developers.google.com/mobile-ads-sdk/docs/admob/mediation#ios-linker

Also be sure to do a clean and rebuild

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