This is the message I get
Impossible to add the product to the cart. textStatus: 'parsererror' errorThrown: 'SyntaxError: Unexpected token F in JSON at position 1' responseText: Fatal error: Uncaught exception 'Exception' with message 'Forbidden chars in cookie' in /storage/content/70/2001270/shiromalou.com/public_html/classes/Cookie.php:176 Stack trace: #0 /storage/content/70/2001270/shiromalou.com/public_html/modules/ganalytics/ganalytics.php(841): CookieCore->__set('ga_cart', 'a:1:{i:20;a:11:...') #1 /storage/content/70/2001270/shiromalou.com/public_html/classes/Hook.php(587): Ganalytics->hookActionCartSave(Array) #2 /storage/content/70/2001270/shiromalou.com/public_html/classes/Hook.php(542): HookCore::coreCallHook(Object(Ganalytics), 'hookactionCartS...', Array) #3 /storage/content/70/2001270/shiromalou.com/public_html/classes/Cart.php(214): HookCore::exec('actionCartSave') #4 /storage/content/70/2001270/shiromalou.com/public_html/classes/Cart.php(1071): CartCore->update() #5 /storage/content/70/2001270/shiromalou.com/public_html/controllers/front/CartController.php(293): CartCore->updateQty(1, 20, 71, 0, 'up', 0) #6 /storage/content/70/2001270/shiromalou.com/public_html/controllers/front/Ca in /storage/content/70/2001270/shiromalou.com/public_html/classes/Cookie.php on line 176