Ios – facebook login issue – canOpenURL: failed for URL: “fbauth2:///” – error: “(null)”

When I click on login with Facebook button, it is opening safari browser and getting closed immediately. Noticed error on the console.

App delegate method:

func application(app: UIApplication, openURL url: NSURL, options: [String : AnyObject]) -> 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)
}

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})

IDE : xcode 7
Language : Swift2
Facebook SDK : 4.6.0
Parse: 1.8.4

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.

Any help?