create a gmap with views -> empty page

Hi!

I'm sorry if this problem is already refered but if it's the case I didn't find it.
I'm a new user of Drupal so maybe my problem comes from my ignorance. I want to create a gmap from views module to display some places where users can spend the night. So I've created a cck type called "lit" with a location field and some "lit". Then, I've created the view you can see on the attached picture. I've circled the fields I changed.
Then, when I go to myWebSite/ou_dormir. I don't see my map :( , just an empty page is displayed.
Can you help me ?

Thanks,
Julie