File Browser Error. Please Help

There's an error in file browser. Each time I try to insert an image to the editor, when I click the browse server, it displays a message like this:

XML request error: OK (200)

Requested URL:
http://localhost/internet_campaign/fcke ... Type=Image

Response text:
...


I use php in my server and I've already change fckconfig.js variables _FileBrowserLanguage and _QuickUploadLanguage values to 'php'