title: Apple Mach-O Linker Error when Run simulator with Facebook SDK
body: <p>I have added Facebook SDK Framework into my Xcode 6.</p>
  
  <p>Then I import it to my AppDelegate.h file.</p>
  
  <p>Then I put this code   [FBLoginView class]; into this function </p>
  
  <ul>
  <li>(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions</li>
  </ul>
  
  <p>And when I clicked on Run Simulator I get this:
  <img src="https://i.stack.imgur.com/CAT6X.png" alt="enter image description here"></p>
  
  <p>I'm a newbie and so confuse about what the error is. Please give me solutions.</p>