iOS: adding Admob ads into app giving an error

Question

My app was successfully running on both simulator and physical device. After adding AdMob into my app by following the instruction in this video , however, the app gives an error when building. I have tried several hours to look for the solution to this error, but could not find it. Do you have any suggestion for this? Thank you

ld: duplicate symbol _OBJC_CLASS_$_AppDelegate in /Users/joe/Library/Developer/Xcode/DerivedData/playSound-dxljeytitbiylehchltjsxksklbh/Build/Intermediates/playSound.build/Debug-iphoneos/playSound.build/Objects-normal/armv7/AppDelegate-B7F42A95B6FCD25F.o and /Users/joe/Library/Developer/Xcode/DerivedData/playSound-dxljeytitbiylehchltjsxksklbh/Build/Intermediates/playSound.build/Debug-iphoneos/playSound.build/Objects-normal/armv7/AppDelegate-B9769CE7F9C30755.o for architecture armv7
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/clang failed with exit code 1

Update:

Even I have not modified any code in my app, just add all the folder of 'GoogleAdMobAdsSdkiOS-6.1.4' in my project explorer as in the video, it then produces the error immediately. I am using xCode 4.2

Answer 1

This may be because 6.1.4 also comes packaged with a Google Analytics xcode project. Try making sure that you remove everything under the 'Add-ons' folder from being referenced in your project (unless you are using it).

Answer 2

You have multiple entries AppDelegate under Targets-Compiled Sources . Check it and ensure there is only one in Compiled Sources .