Hi everyone,

I'm a recent Odoo user and i'm trying to develop and install a few modules for a project.
I've just downloaded a completary module for POS source files that I'm trying to install.
My problem is that I can "upload" it without problem (, but when I try to install, the button turns into "cancel install" and installation doesn't proceed. I've no idea where to start so i'll be thankful for any app ?

I'm using Odoo 8.0 with CentOS 7 on virtualbox 5.1.7

Source I downloaded : http://thierry-godin.developpez.com/openerp/tutorial-module-creation-pos-modification-english-version/