the project phpvirtualbox is not very active, some bugs are not corrected therefore i let this contribs in a beta stage.
But if needed i can take time to get off the feature which doesn't work and let the contrib withouth the concerned feature bugged.
The feature is the authentication of admin, groups and users selected ....but without that you are merely to install alone phpvirtualbox, because it is quite simple to do it
i raise a bug...
http://sourceforge.net/p/phpvirtualbox/bugs/7/promise i look this and when the time comes, i will publish the contribs.
is it not a bit early to use sme9, why do you want to use it, there are only very few contribs and probably i hope many new features which can broke your server....