It was my main (only?) station. I had some 30 songs on it, pretty good sampling of my tastes (pretty typical pop/rock/etc. music... Daughtry, Train, etc.). It gave me great recommendations which for a while completely blew my mind over and over (when my friend told me about the human classification part, I was like, I KNEW there was no way a machine could've done this so well), but it eventually outright failed and just gave me that message. So I gave up on it too. I guess that's better than Spotify which just plays my own songs over and over again at my "radio" stations...

I got that message before. I found that if you switched stations and then switched right back the problem would magically go away.