error page category

-- url of the page with the problem -- : misscarteras.co
-- HikaShop version -- : HikaShop Starter 2.6.1
-- Joomla version -- : Joomla! 3.4.8
-- PHP version -- : PHP 5.5
-- Browser(s) name and version -- : chrome

I have this website but when we are working on products page category and need to move to another page and see my other products, this page is blank in the administration part. I can not see other products
attached photos