I had the same problem . I had to redownload Plarium play app. Then there was a download for Vikings and it worked. I was trying to launch the game from a bookmark for the launcher and it has been changed. The ships are gone and now its a training book. I had deleted the Plarium app cause I didn't like looking at the icon when I wasn't using it to launch the game.

I had a little trouble getting my settings back the way I liked em, cause everything got reset. The windowed mode was too big to drag and drop to get it as small as I wanted and the chat and process windows had changed. I just shrank the window until the icons changed like I had them and now everything is back like I had it. Music was back on too, but it was easy fix. 

Hope you can do like I did and get back in, GL.

In case you are worried, it started back at the same lvl I was and all my lvls and goods like they were before.