iOS Parse Facebook Login error 308 FBSDKLoginBadChallengeString

Question

I\'m trying to implement Facebook login in my iOS app, using Parse.

let permissionsArray = [\"public_profile\", \"email\"]

PFFacebookUtils.logInInBackgroun         


        

Answer 1

if log out and login again without leaving this app,this error also come,

let deletepermission = FBSDKGraphRequest(graphPath: "me/permissions/", parameters: nil, HTTPMethod: "DELETE")
            deletepermission.startWithCompletionHandler({(connection,result,error)-> Void in
                println("the delete permission is \(result)")
                dispatch_async(dispatch_get_main_queue(), { () -> Void in
                    FBSDKAccessToken.setCurrentAccessToken(nil)
                    FBSDKProfile.setCurrentProfile(nil)
                    fbLoginManager.logOut()
                    AppDelegate.sharedAppDelegte().logout()
                })
            })