Proxy Server Problems using Tor

Tor is not working properly.  I have Firefox installed.  And I installed the Tor bundle.  But if I go to a website using Tor, the pages that come up have the following message embedded on the page and I don't know how to sort it out:  Can anybody help?  

Unable to find the proxy server

Firefox is configured to use a proxy server that can't be found.

    Check the proxy settings to make sure that they are correct.
    Check to make sure your computer has a working network connection.
    If your computer or network is protected by a firewall or proxy, make sure that Tor Browser is permitted to access the Web.