Front-End User Login & Logout Errors while visiting the protected page

[cupidsd]

Hey, I am now using GetSimple & front-end user login plugin to build our lab's website. It works fine. But I got a problem when I am trying to test the front-end user login plugin. The errors are as follows:

If I access a page protected by the user login module first, which means only authorized users can access this page, and then logg into our website, the error will be shown on the website:

http://192.168.44.129/GetSimple_3.0//members

Not Found

The requested URL /GetSimple_3.0//members was not found on this server.

Apache/2.2.17 (Ubuntu) Server at 192.168.44.129 Port 80

The same error occurs when logging out if I am still visiting the protected pages.

Thanks.