Error 404 After Hikashop New User Registration

-- url of the page with the problem -- : www.mycentralino.com/hikashop-menu-for-h...eckout/activate_page
-- HikaShop version -- : 3.0.1
-- Joomla version -- : 3.6.0
-- PHP version -- : 5.4.16
-- Browser(s) name and version -- : Chrome 56.0.2924.87
-- Error-message(debug-mod must be tuned on) -- : Error 404 Page Not Found

After a user registration I got an error 404
www.mycentralino.com/hikashop-menu-for-h...eckout/activate_page

I have no problem with SEF, working well in all the website.

The registration goes well (i mean I receive the email with the link for confirmation....)

Please support

Thanks Jerome,
re-downloaded the 3.0.1 and applied

what I got now it is better (no 404)
but I'm addressed to an empty page and not to the page that says "you will receive an email for confirmation....."

Please see below

Thanks a lot
enabled system messages and everything is ok
Regards
Tommaso