The requested URL / was not found on this carrello.html server.

[adempius]

Joomla 2.5.9, VM 2.0.20b
www.cleansmoke.it
Then I have a problem with the checkout or cmq with the display of the cart once filled
I get this error when I click cart

Not Found

The requested URL / was not found on this carrello.html server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

[adempius]

Not Found

The requested URL /index.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

[jenkinhill]

Sounds like you may have "Enable SSL for sensitive areas" turned on in Configuration/Shop but do not have the server configured to use SSL.

You also have a JavaScript problem, so probably need to use jQueryEasy - see http://forum.virtuemart.net/index.php?topic=111843.0