Can't log into LG smart TV app

[Gozarak]

Hello!
I want to use Spotify on my LG smart TV (modell: 47LA7408-ZB; software: 04.28.14)
I've downloaded the app from smart world but when I type in my account details the loading circle appears and it's do nothing else. I tried with new account etc. but doesn't seem to work. I either can't cast it from smartphone to the TV beacuse Spotify can't find my TV.
If you have any solution please share with me.

[user-removed]

Sorry, Please try to login again with Spotify's premium account. Unfortunatly, a free user can not use the service.

[Gozarak]

I've tried it as premium member.

[Gozarak]

Sadly it doesnt work