title: installing adMob banner gives me strange Mach-O linker error
body: <p>Hi i was trying to install adMob Ad in my app but xcode gives me this error</p>
  
  <blockquote>
    <p>ld: framework not found AudioUnit clang: error: linker command failed
    with exit code 1 (use -v to see invocation) ld: framework not found
    AudioUnit</p>
  </blockquote>
  
  <p>the audioUnit.framework was not to add (reading the tutorial i was following) but it gave me 3 errors saying that i needed it so in added but it gives me this error.
  This is the code for the banner</p>
  
  <pre><code>//.h
  //admob
  #import "GADBannerViewDelegate.h"
  #import "GADBannerView.h"
  #import "GADRequest.h"
  @class GADBannerView, GADRequest;
  
  @interface ArrayDetailViewController : UIViewController &lt;ADBannerViewDelegate, GADBannerViewDelegate&gt;
  {
      //admob
      GADBannerView *bannerView_;
  }
  //admob
  @property (nonatomic, retain) GADBannerView *adBanner;
  
  //.m
  //admob
  @synthesize adBanner = adBanner_;
  
  - (void)viewDidLoad
  {
      [super viewDidLoad];
      //admob
      self.adBanner = [[GADBannerView alloc]
                       initWithFrame:CGRectMake(0,self.view.bounds.size.width-66,self.view.bounds.size.height,66)];
      self.adBanner.adUnitID = @"pub-5290085476815648";
      self.adBanner.delegate = self;
      [self.adBanner setRootViewController:self];
      [self.view addSubview:self.adBanner];
      //self.adBanner.center = CGPointMake(self.view.center.x, self.adBanner.center.y);
      GADRequest *r = [[GADRequest alloc] init];
      r.testing = YES;
      [self.adBanner loadRequest:r];
  }
  
  //admob
  - (void)adViewDidReceiveAd:(GADBannerView *)adView
  {
      NSLog(@"Received ad successfully");
  }
  
  - (void)adView:(GADBannerView *)view didFailToReceiveAdWithError:(GADRequestError *)error
  {
      NSLog(@"Failed to receive ad with error: %@", [error localizedFailureReason]);
  }
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/cGrlC.png" alt="enter image description here"></p>