Error 500 view class not found [class, file]

-- HikaShop version -- : 2.6.
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.6
-- Browser(s) name and version -- : all

Hello,

We did check the website with a 404 checker, and get error 500 messages.
This issue happened when we moved the webshop (hikashop) menu from the page /webshop to the main menu.

First you had to click on webshop in the main menu to get to the products pages. Now you can select product pages in the mainmenu.

We after we accomplished this, we got for all our webshop categories in the main menu a 500 error.

View class not found [class, file]: categoryViewproduct,
in /components/com_hikashop/views/product/view.html.php

How can we resolve this?

Thank you

Hello,
I checked your website and I didn't succeed to reproduce your issue, it seemed to work fine, can you give me a step by step of how to reproduce your issue ?
Thanks.

Hello,

We checked the domain with: validator.w3.org or 404checker.com
There we found that there are several lines of our menu items (maybe not related, but this was when the issue happened first) that gave this error:

error Line: 140 /pmu-apparatuur
Status: 500 View class is niet gevonden [class, file]: /components/com_hikashop/views/product/view.html.php

This is a server side problem. Check the URI.

First this issue was on line 139, now on 140, these are the corrensponding lines in the view.html.php
line 139: $this->assignRef('cart',$cart);
line 140: $this->assignRef('maxFilter',$maxFilter);