Fail to start VM in VirtualBox

When I start a VM I get this error:
Code:
Failed to open a session for the virtual machine CentOS.
The virtual machine 'CentOS' has terminated unexpectedly during startup because of signal 10.

Result Code: 
NS_ERROR_FAILURE (0x80004005)
Component: 
Machine
Interface: 
IMachine {6d9212cb-a5c0-48b7-bbc1-3fa2ba2ee6d2}
I try to rebuildworld, reinstall VirtualBox but nothing work.
I have FreeBSD 8.1 stable-amd64.
 
Maybe it's 'STABLE' problem, I am using FreeBSD amd64 8.1-RELEASE/8.1-RELEASE-p1 with VirtualBox (and even used CentOS 5.5 under there) and everything works as advertised (on 2 separate computers).
 
I had a similar problem that was caused by old version of vboxXXX.ko left in /boot/modules. The system insisted on loading vboxXXX.ko.old on reboot. I solved it by moving the *.old out of the way and run kldxref /boot/modules
 
Removing vboxXXX.ko from /boot/modules and install vboXXX modules from ports solved my problem.

Code:
kldunload vboxdrv
rm /boot/modules/vbox*
cd /usr/ports/emulators/virtualbox-ose-kmod && make install clean
kldload vboxdrv
 
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