Element already exist

-- url of the page with the problem -- : dodowear.nl
-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.3.4
-- Error-message(debug-mod must be tuned on) -- : Element already exist

Hi,
I'm trying to set my categories like this:
Meisjes/Broeken en Jeans/Spijkerbroeken

And
Jongens/Broeken en Jeans/Spijkerbroeken

But when I create the underlined subcategory I get the message Element Already exist
Can you tell me how to overcome this?

Hello,
You'll probably just have to change the value of the "Alias" option through your category configuration page (Hikashop->Products->Categories->'YourCategory').