Switched to PHP5 and CI Broke, Please help!

[eluser]Phani K[/eluser]
Hi

When i follow the given link i.e http://github.com/benedmunds/CodeIgniter-Ion-Auth

i am able to see the login page in my application.
when i give the login credentials as specified in the readme file and submit.
it is redirecting to the page "http://localhost/ci172/index.php/auth/index.php/auth/login"

what i need to fix in my code?

Note:
1) I didnt added any new controllers yet.
2) My codebase is in /opt/lampp/htdocs/ folder
3) My codebase structure...

phanik@phanik-desktop:/opt/lampp/htdocs/ci172$ ls
application index.php nbproject system user_guide