Oh darn, that's too bad. Then you kind of run out of options. What OS build do you have? Then I can warn others before they download.
I have heard of another player trying Wine and it worked on there :)
Alternatively, you could locate the file in \Game.app\Contents\Resources\app.nw\img\pictures and delete the file joselina_avatar.png. This should allow you to get past the beginning screen and let you read the story. You're not able to use the option "Outfit" in the main menu though, as you'll get the same error as before (though feel free to try).