offline mode doesn't work - iphone 4s.

[lillathunis]

I can't listen in offline mode anymore, when I add a new track to my list I get a pop up message witch says :

 " There was an error communicating with spotify. Some tracks couldn't be made availeble offline. Spotify will try again later " .  

So can anyone tell me why it doesn't work?  I have spotify premium and I have internet connection.  It have been like this in a few months now, and it is really annoying...