USB don't work!

[jelle]

When I try to attach a usb-stick VirtualBox don't find any usb-sticks. When I click at Sytem, I get a message:

Het is niet gelukt om toegang tot het usb subsysteem te krijgen.
Resultaat code:
NS_ERROR_FAILURE (0x00004005)
Component:
Host
Interface:
IHost {35b004f4-7806-4009-bfa8-d1308adba7e5}
Callee:
IMachine {662c175e-a69d-40b8-a77a-1d719d0ab062}
Sorry, I'm Dutch, maybe you can translate it with google translate.
Then I click OK. And go to the USB page. I have two usb-sticks attached but when I click on the +usb button there are no options.
The list is empty. I hope you can help me.

[Perryg]

Make sure that you have installed the Extension Pack. How to install Extension Pack
And that your user name in in the vboxusers group on the host (a minimum of log off and in due to permission changes).