wp-members login error

Hello.
I have a question.
I am using login form shortcode as below. (page url: http://example.com/login)
[wpmem_form login redirect_to=”http://www.example.com”%5D

When I try login and if the password does not match, homepage address changes to “http://www.example.com/login/?loginfailed” and nothing happens.

If I entered only id, not password, and tried login, login fail dialogue turned up.
Is there any solution for this problem?

I tried permalink modification, wp-members option change and other many things and couldn’t correct this error.

Would you help?