virtualbox.org

I can't seem to activate my 360 controller under the client, every time I do it displays this message:

Failed to attach the USB device ©Microsoft Corporation Controller [0114] to the virtual machine Windows XP.

USB device '©Microsoft Corporation Controller' with UUID {a92d2718-df9a-4592-aea6-740106e14207} is busy with a previous request. Please try again later.

Result Code: E_INVALIDARG (0x80070057)
Component: HostUSBDevice
Interface: IHostUSBDevice {173b4b44-d268-4334-a00d-b6521c9a740a}
Callee: IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392}

Any ideas?

Google "busy with a previous request" site:forums.virtualbox.org