Having problems changing video EFI mode

[nuke]

I read in the manual that you should be able to set the video mode on Snow Leopard guest (EFI) with the command

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VBoxManage setextradata vmname VBoxInternal2/EfiGopMode N
Where N can be one of 0,1,2,3,4 referring to the 640x480, 800x600, 1024x768,
1280x1024, 1440x900 screen resolution respectively.

So I tried but get the error

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sudo VBoxManage setextradata SnowLep VBoxInternal2/EfiGopMode 3
Oracle VM VirtualBox Command Line Management Interface Version 3.2.4
(C) 2005-2010 Oracle Corporation
All rights reserved.

ERROR: Could not find a registered machine named 'SnowLep'
Details: code VBOX_E_OBJECT_NOT_FOUND (0x80bb0001), component VirtualBox, interface IVirtualBox, callee nsISupports
Context: "FindMachine(Bstr(a->argv[0]), machine.asOutParam())" at line 583 of file VBoxManageMisc.cpp

If I do

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VBoxManage list vms

I get the name of the vm to be "SnowLep".

Also if I

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VBoxManage getextradata "SnowLep" enumerate
Oracle VM VirtualBox Command Line Management Interface Version 3.2.4
(C) 2005-2010 Oracle Corporation
All rights reserved.

Key: GUI/LastGuestSizeHint, Value: 1024,768
Key: GUI/LastWindowPostion, Value: 7,44,1024,790
Key: GUI/MiniToolBarAlignment, Value: bottom
Key: GUI/SaveMountedAtRuntime, Value: yes
Key: GUI/ShowMiniToolBar, Value: yes

it finds the vm.

Could someone tell me what I am doing wrong with the statement that it won't change the resolution to 1280x1024?
Thank you.

[baf]

What's wrong: sudo

Forget sudo.

When you use that you are trying to change root:s vm named SnowLep not your vm.

[nuke]

Thanks. That worked!