AdMob crashes with [GADObjectPrivate changeState:]: unrecognized selector
admob, iphone, objective-c
Solution
You need to add `-ObjC` to the Other Linker Flags of your application target's build setting:
- Click the blue top-level project icon in XCode
- Choose your target and go to Build Settings
- 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
Problem
I have installed the AdMob SDK 6.2.0 (Xcode 4.5 (4G182) and I am testing on an iPhone 4S and the simulator). I followed the tutorial and just want to get AdMob showing a banner once. But it crashes on the last line: ``` self.bannerView = [[GADBannerView alloc] initWithFrame:CGRectMake(0.0, self.view.frame.size.height - GAD_SIZE_320x50.height, GAD_SIZE_320x50.width, GAD_SIZE_320x50.height)]; self.bannerView.delegate = self; self.bannerView.adUnitID = @"xREMOVEDBYMEx"; self.bannerView.rootViewController = self; [self.view addSubview:self.bannerView]; GADRequest * request = [GADRequest request]; request.testing = YES; [self.bannerView loadRequest:request]; ``` The crash is 2012-09-28 09:03:58.268 NewProject[1467:c07] -[GADObjectPrivate changeState:]: unrecognized selector sent to instance 0x95c17d0 2012-09-28 09:03:58.276 NewProject[1467:c07] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[GADObjectPrivate changeState:]: unrecognized selector sent to instance 0x95c17d0' This looks like a bug in the library to me but I think thats very unlikely. Any thoughts? EDIT: The exact same code works in the example projects. Is there something I can do wrong with my project file that would result in that error?