Issue to load index page

[eluser]TrexXx[/eluser]
Hello everyone,

I have uploaded my project on my server (1and1), but I have a problem.
The URL of my web site is : http://www.sasravey.fr , but when you go to, it doesnt work, I see the 404 error page.
If I go to http://www.sasravey.fr/index.php/ , it works...
Where is the problem ?

Thanks for your help