title: build error while add revmob ad in iOS app
body: <p>I want to add RevMob add in my app  but there are some errors </p>
  
  <pre><code>Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_SKStoreProductViewController", referenced from:
    objc-class-ref in RevMobAds(RevMobStoreController.o)
  "_SKStoreProductParameterITunesItemIdentifier", referenced from:
    -[RevMobStoreController openStoreWithITunesItemId:] in RevMobAds(RevMobStoreController.o)
  ld: symbol(s) not found for architecture i386
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>I have added <code>StoreKit</code>,<code>SystemConfiguration</code> and <code>RevMob</code> Frameworks already.
  I am using Xcode4.3 and ios4.2 
  Plz help me.
                                                    Thanks in advance.</p>