Issue with Ask-a-question form

[UltraLord]

Hello everyone,

I'm having troubles with the ask a question form.

When the form is submitted I get an error message like: "some fields are not correct"..
but there are only 3 fields (Name,email,message) and they are correctly filled.

I'm using Joomla 1.7.3 and VM2.
the site link is:  http://ilviaggio.mariannacarboni.it

Thanks
G.