VirtualBox is not started

[-andria-]

Dear all,

I have installed VirtualBox,
$ rpm -qa | grep -i virtualbox
VirtualBox-3.1-3.1.6_59338_
fedora12-1.i686

and sucessfully recompiled, linux kernel with VirtualBox module.
Removing old VirtualBox kernel module                      [  OK  ]
Recompiling VirtualBox kernel module                       [  OK  ]
Starting VirtualBox kernel module                          [  OK  ]

but when I start VirtualBox, it says:
VirtualBox: supR3HardenedMainGetTrustedMain:
dlopen("/usr/lib/virtualbox/VirtualBox.so",) failed:
/usr/lib/virtualbox/VirtualBox.so: undefined symbol:
_ZNK14QDesktopWidget17availableGeometryEPK7QWidget

what does it mean?

thank you,
-andria
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