Are you connected to the Internet? The files are pulled up once during the initial build, from a remote repository (rather than being stored along with the source code, as in previous versions). Once thirdparty is downloaded, you don't need to be connected anymore (unless you change a thirdparty jar version, or delete the thirdparty dir).
yes, rali. I am connected to the internet and I do can access those files through the I.E. browser...Do you think it could be a problem of firewall?
Might be a firewall setting - try disabling it for a little bit while you are pulling the jars, and see if this is the case. I could verify that the repository site is responding, since I am able to download the jars, so the prob should be something else.