Im installing this module Ecommerce catalog without price on Odoo v9 installed in CentOS7 remote server.

Both dependencies listed are installed on odoo already but I get an error:

Error details:Element '<xpath expr="//del[@class='text-danger mr8']">' cannot be located in parent view
Error context:View `Suggested Products Without Catalog Price`[view_id: 924, xml_id: n/a, model: n/a, parent_id: 894]None" while parsing None:23, near<data inherit_id="website_sale.cart_lines" name="Suggested Products Without Catalog Price"> <xpath expr="//del[@class='text-danger mr8']" position="replace"> <field name="text-danger" invisible="1" nolabel="1"/> </xpath> </data>

How should I debug this and find out what the problem is?  In other words, how do I find out why that mr8 view cannot be located?