Error executing RDS command. Status Code:404

Question

The following problem really made crazy. I worked it for a whole day and still didn't figure it out. could someone help me ? Thanks a million.
I created a project using this way:
and select a tomcat server 6.0.*
and my RDS configuration in my web.xml is this:
part of my web.xml
<servlet>
        <servlet-name>RDSDispatchServlet</servlet-name>
        <display-name>RDSDispatchServlet</display-name>
        <servlet-class>flex.rds.server.servlet.FrontEndServlet</servlet-class>
        <init-param>
            <param-name>useAppserverSecurity</param-name>
            <param-value>false</param-value>
        </init-param>       
        <load-on-startup>10</load-on-startup>
    </servlet>
    <servlet-mapping id="RDS_DISPATCH_MAPPING">
        <servlet-name>RDSDispatchServlet</servlet-name>
        <url-pattern>/CFIDE/main/ide.cfm</url-pattern>
    </servlet-mapping>
when I created my flex project, and added it to the server using the way of Add web module... . After that, I started my server, and changed to this view:
I clicked "Connect to Data/Service..." and selected the service type "BlazeDS". When the Flash  Builder popped up a Authentication window, I checked "No password required" and clicked the OK button, and then, the problem comes out.
Any clues for this problem? Thank you.

Answer 1

With all the problems people have with this error, you'd think there would be a FAQ about it. is this it? no answers?
no one knows why this happens with eclipse/FB4 on a windows xp system? is this the kind of support you get from Adobe?
this is EXTREMELY frustrating!!!!!!! please Adobe,HHHEELLPPP!!!!!