Working fine for me.
I did get same error as you when using an invalid token.
So, you probably just need to logout and login again to fix.
I have also just uploaded a new 0.9.2 version of the add-on.
I have edited my other post to point to the new version.
This will give you a better error message when it can't play.
Thanks you were right, just logged out and back in and it worked.
Also tried 0.9.2 and works fine too. Thanks for your help.