Just happened to me as well...

And now I can't get into the game at all. The farthest I can go is to the Login screen...

When I first logged in, I tried to spectate a game and this message showed up:
ERROR in
action number 1
of Draw Event
for object Card1:

Trying to draw non-existing sprite.

Now I can't log in without it leading me to a field ad giving me the same message Help please...
Btw what's the verification answer for the main antagonist?