Xcode and AdMob on iPhone 3.2

How do I fix the following error:

开发者_运维百科

Undefined symbols:

"_OBJC_CLASS_$_AdMobView", referenced from:

objc-class-ref-to-AdMobView in AdWhirlAdapterAdMob.o

ld: symbol(s) not found

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check your libraray search paths in your project info. Make sure to remove the / slashes that sometimes appear outside of the quotes "" that contain your linked frameworks.

Also did you make sure to drag the Admob libraries into your project?