Cannot access the web server error on Glassfish v3

I have developed a web application in Eclipse 3.6 on GlassFish v3 and i am trying to add a FlexProject to it.

I have deployed Dlazeds on Glassfish and i followed this tutorial to create a flex project : http://sujitreddyg.wordpress.com/2009/04/07/setting-up-blazeds/

I changed the web.xml file to match the schema but when i try to create a 开发者_JAVA技巧new Flex Project i get this warning :

"Cannot access the web server. The server root folder or root URL may be invalid"

I cannot figure out the problem,i have googled it but i didn't get any answers.

Can you help me please ? It's really frustrating.

Thank you.

The best article describing how to setup a Flex/Java project is on Mihai blog, in case you did not already found it. The steps done by Flex Builder in order to validate the server root are:

1)Check if the server root exists

2)Check if services.xml or flex-config.xml exists

3)Creates a temporary file and checks for it with a GET command on the server port.