Problem with the error text messages

Hello,

the plugin is fantastic but I have problems with the text message in error case.
For exemple:
1)try to login with wrong username/password, no message I get, I see only a red line
2)try to retry my password but if the email isn’t in database no message I get only a red line is visible
3)try to register with username/email alredy in database, no message I get only a red line

Where is the problem? In the plugin TML or in wordpress?

Thank you all for the support.

http://ww.wp.xz.cn/plugins/theme-my-login/