When add product to cart, redirect page blank

-- url of the page with the problem -- : www.incarfer.com/web-nueva/
-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.4.33
-- Browser(s) name and version -- : Chrome 45
-- Error-message(debug-mod must be tuned on) -- : Screen blank

Hello
In my site when add product to cart and redirect to www.incarfer.com/web-nueva/product/updatecart this page in blank
Add screenshot
I need help.
Thank you very much

Hello,
Can you :
- Activate the Joomla debug mode ("Administration->Global configuration->System->Debug System/Language")
- Set the "error reporting" option of the Joomla configuration to "maximum"
- Test it again so that you can see if it display an error message which will help you to understand from what your issue is coming.
Thanks.

Operations performed.
The Page Fault in continuous white

Thanks Nicolas
Change configuration and now when add product to cart, all okey (popup when information).
If click submit in this popup is ok redirect to checkout page, but if click in button submit on Hikashop cart module, page blank.
Add screenshot where click and bug.

Hello
Not any solution for this problem?
Thanks