title: facebook login issue - canOpenURL: failed for URL: "fbauth2:///" - error: "(null)"
body: <p>When I click on login with Facebook button, it is opening safari browser and getting closed immediately. Noticed error on the console.</p>
  
  <p>App delegate method:</p>
  
  <pre><code>func application(app: UIApplication, openURL url: NSURL, options: [String : AnyObject]) -&gt; Bool {
      print("###### URL : ")
      print(url)
      print("###### App : ")
      print(app)
      print(options["UIApplicationOpenURLOptionsSourceApplicationKey"])
      return FBSDKApplicationDelegate.sharedInstance().application(app, openURL: url,  sourceApplication: options["UIApplicationOpenURLOptionsSourceApplicationKey"] as! String,
              annotation: nil)
  }
  </code></pre>
  
  <pre>
  2015-09-18 18:37:51.410 [21036:5050465] -canOpenURL: failed for URL: "fbauth2:///" - error: "(null)"
  
  2015-09-18 18:37:51.417[21036:5050465] -canOpenURL: failed for URL: "fbauth2:///" - error: "(null)"
  
  ###### URL : 
  
  fb4554284912963222://authorize/?error_code=100&error_message=Invalid+Scope%3A+public&state=%7B%22challenge%22%3A%222ZmK6R5F05d%252F060TkCqj8SjPLjc%253D%22%2C%220_auth_logger_id%22%3A%223C79F2C8-61B9-470E-AE1B-E1C68435DB83%22%2C%22com.facebook.sdk_client_state%22%3Atrue%2C%223_method%22%3A%22sfvc_auth%22%7D&e2e=%7B%22init%22%3A145973.000512302%7D#_=_
  
  ###### App : 
  
  
  Optional(com.apple.SafariViewService)
  nil
  
  ###### err:
  
  Optional(Error Domain=com.facebook.sdk.core Code=8 "(null)" UserInfo={com.facebook.sdk:FBSDKGraphRequestErrorGraphErrorCode=100, com.facebook.sdk:FBSDKErrorDeveloperMessageKey=Invalid Scope: public, com.facebook.sdk:FBSDKGraphRequestErrorCategoryKey=0})
  </pre>
  
  <p>IDE : xcode 7<br>
  Language : Swift2<br>
  Facebook SDK : 4.6.0<br>
  Parse: 1.8.4</p>
  
  <p>I have also verified .plist is having all keys which are required.
  Also verified the bundle identifier for typo mistakes. All look good.
  Facebook is active.</p>
  
  <p>Any help?</p>