problem with FCKeditor

Please i need some help !!!!!!!!!! i'm trying to upload image with fckeditor but the server it is sending me this error

The server didn't send back a proper XML response. Please contact your system administrator.

XML request error: Not Found (404)

Requested URL:

/fckeditor/editor/filemanager/connectors/php/connector.php?Command=GetFoldersAndFiles&Type=Image&CurrentFolder=%2F&uuid=1230039934238

Response text:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

       "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot;&gt;

<html xmlns="http://www.w3.org/1999/xhtml&quot; xml:lang="en" lang="en">

<head>

  <meta http-equiv="content-type" content="text/html; charset=UTF-8" />

  <title>The page you were looking for doesn't exist (404)</title>

  <style type="text/css">

    body { background-color: #fff; color: #666; text-align: center; font-family: arial, sans-serif; }

    div.dialog {

      width: 25em;

      padding: 0 4em;

      margin: 4em auto 0 auto;

      border: 1px solid #ccc;

      border-right-color: #999;

      border-bottom-color: #999;

    }

    h1 { font-size: 100%; color: #f00; line-height: 1.5em; }

  </style>

</head>

<body>

  <!-- This file lives in public/404.html -->

  <div class="dialog">

    <h1>The page you were looking for doesn't exist.</h1>

    <p>You may have mistyped the address or the page may have moved.</p>

  </div>

</body>

</html>

Please help!!!!!!!!!!!!!!!!!

May I ask..... do you use on windows machine??? In my office, My friend get same error.. bu when i try it on linux machine... I don't get error...

Please check with other machine.

i'm using linux