after i run the ievonyclient.exe step one account verification.. step one success. then step two : invitation method is have two choose. I choose Email (Gmail, Yahoo!, Aol, Hotmail) then step three select your email system then I choose Yahoo! then step four is login yours Yahoo mail then write my email but doesn't exist @yahoo.co.id....... WHY????? That make me fail to invite my friend and earn coin.