Last FM unknown error

Lastfm use to work until Dec 2013. Now it works until I go to play a station. Try to play and I get “unknown error” Is there somehow to reset this app ?

I’m currently experiencing this failure mode. Would anybody, by any chance, know how to fix this issue?
I’ve found a couple of threads in this forum about this subject but no fixes or suggestions as to what to try.
Thanks,
Jorge