title: facebook invite example can run simulator but not run iPhone device
body: <p>facebook app invite:</p>
  
  <pre><code>FBSDKAppInviteContent *content = [[FBSDKAppInviteContent alloc] init];
  NSString *appLink = [@"https://fb" stringByAppendingString:@".me/176327329406660"];
  content.appLinkURL = [NSURL URLWithString:appLink];
  [FBSDKAppInviteDialog showFromViewController:self withContent:content delegate:self];
  </code></pre>
  
  <p>simulator run well, but iPhone device is not.</p>
  
  <p>the errose app invite error:</p>
  
  <blockquote>
    <p>Domain=com.facebook.sdk.core Code=9 "(null)"</p>
  </blockquote>