[Plugin: WordPress.com Stats] am i lose my site, how can get it back,,?

when i am configuring the plugin “wordpress.com stats”, it ask me to enter an api key, then i enter it, then it said that the api key has been used for another blog, there is button that i dont remember the word, i think the word was “add new wordpress blog”, then i clicked it, then my has no view, it blank, you may see it here http://rumahkurezekiku.com/

http://wordpress.org/extend/plugins/stats/