ios - xCode 6.4 Swift - Implementation of Facebook Login Error -

i following tutorial (https://www.youtube.com/watch?v=cpanieebe2m) implement facebook login. did exact same thing , checked twice, error while compiling doesn't get.

in appdelegate.swift:

 func application(application: uiapplication, didfinishlaunchingwithoptions launchoptions: [nsobject: anyobject]?) -> bool {     // override point customization after application launch.     func application(application: uiapplication, didfinishlaunchingwithoptions launchoptions: [nsobject: anyobject]?) -> bool     {         // override point customization after application launch.         return fbsdkapplicationdelegate.sharedinstance().application(application, didfinishlaunchingwithoptions: launchoptions)     }     func application(application: uiapplication, openurl url: nsurl, sourceapplication: string?, annotation: anyobject?) -> bool     {         return fbsdkapplicationdelegate.sharedinstance().application(application, openurl: url, sourceapplication: sourceapplication, annotation: annotation)     } 

and error second function: definition conflicts previous value, expected declaration.

i hope understands error here, thanks.