couldn't login

Hi, installed the plugin.
I choosed the pasword sent tru email setting.
But i couldn’t login with it, after many tries.
(in the end i removed 2 factor auth with “reset owner” in my adminpanel)
I do have to say i have already this security plugin working.

http://www.mrred.it/chap-secure-login-a-wordpress-plugin-for-secure-password-authentication/

Could this be the cause of the conflict?
grts

http://ww.wp.xz.cn/plugins/two-factor-auth/