Error: ‘Unable to load Skin” when using Profiles?!

Hi,
I’m a total noob and I’m trying to setup Kodi with separate profiles for each of member of the family. But I further wanted to have submenus because we are a trilingual family so that it would look something like this:

Profile ‘DAD’:

==> (submenu) ==> English

Movies ==> (submenu) ==> French

==> (submenu) ==> German

and the same for the two other profiles (MOM & KIDS)

So, from googling I learned that only a few skins offer customizing menu/submenus, and Aeon Nox came up most often so I decided to try that.

So I have the Master Profile + 3 Profiles (DAD, MOM & KIDS).
However, when I try to login into each profile, I am always welcomed with the same error: “Unable to Load Skin. Missing FIles”.

Am I doing something wrong? Does something need to be enabled or….what? Help!!? Sad