SPTAudioStreamingController throwing "Wrong username or password" when login player with accessToken

[RndTBit]

Hi, 

In my iOS application I am login user through SPTSessionManager and saving the given accessToken, refreshToken and expiration date. Later I refresh the access token 5 mins before the expiration.

I want to play tracks using SPTAudioStreamingController. Every time when I am opening my app I use to configure my player like this,

 = = = = = = = = = = = = = = = = = = = = = = =

        self.player = SPTAudioStreamingController.sharedInstance()

            self.player?.delegate = self

            do {

                try? player?.start(withClientId: clientID)

                self.player?.login(withAccessToken: accessToken)

            }

            catch (let err) {

                debugPrint(String(describing: err))

            }

 = = = = = = = = = = = = = = = = = = = = = = =

But I am getting an error in the delegate function "didReceiveError" of SPTAudioStreamingDelegate and the error is 

Error Domain=com. Spotify.iOS-SDK.playback Code=8 \"Wrong username or password\"

What it could be the reason behind it? Am I doing the right thing when configuring player?

***One thing I have noticed, whenever(even when i am installing the app for the first time) self.player?.loggedIn return always true, though I am not using this variable anywhere yet***