rt,最近注册了一个USACO号，在主页能正常登陆，但是在training gateway 登录时显示The name/password combination is invalid. Please try again. 找回密码时显示The appropriate database entries do not exist for '@126.com'. Please enter a valid name/password combination or register for a new name/password.//略去邮箱 这是怎么回事？