Getting error _OBJC_CLASS_$_AdMobView while compiling in iPhone SDK 4

I implemented Admob in my application previously in 3.x versions of SDk there i used libAdMobDevice3_0.a frame work. But now i am using 4.o version when i开发者_开发问答 am compiling i am getting the compilation error _OBJC_CLASS_$_AdMobView can any one give me the link from where i can download Admob 4

Thank You Kiran Manthena

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From your AdMob account you will get the latest version of AdMob.