[xwiki-users] Lyrebird skin (doesn't work)

Hello all, I am very enthusiast about using the Lyrebird skin. I downloaded the XAR, imported it in my wiki. But unfortunately nothing happen when I enter 'Lyrebird' in the field where we have to set the skin. Nor when I add skin=Lyrebird in the parameters of my query... Could anyone help in setting this skin in my wiki?! Thanks for your help, Nicolas