Failure to activate VRDP multiple connections

[Yoleusenive]

Hi, there,

I've installed WinXP on an MacOS X host. It was possible, to clone this VM with the command

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VBoxManage clonehd "/Virtuelle Maschinen/WinXP Arbeit" "/Virtuelle Maschinen/WinXP_Testsystem"

.

Now I want to use 2 Displays with that VM. But after typing the command

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VBoxManage modifyvm "/Virtuelle Maschinen/WinXP_Testsystem" -vrdpmulticon on

I get the following error message:

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[!] FAILED calling a->virtualBox->FindMachine(Bstr(a->argv[0]), machine.asOutParam()) at line 1594!
[!] Primary RC  = VBOX_E_OBJECT_NOT_FOUND (0x80BB0001) - Object corresponding to the supplied arguments does not exist
[!] Full error info present: true , basic error info present: true 
[!] Result Code = VBOX_E_OBJECT_NOT_FOUND (0x80BB0001) - Object corresponding to the supplied arguments does not exist
[!] Text        = Could not find a registered machine named '/Virtuelle_Maschinen/WinXP_Arbeit.vdi'
[!] Component   = VirtualBox, Interface: IVirtualBox, {339abca2-f47a-4302-87f5-7bc324e6bbde}
[!] Callee      = IVirtualBox, {339abca2-f47a-4302-87f5-7bc324e6bbde}
My_Mac:~ Me$

Why can't VBoxManage now not find the VM when it cloned it before without any errors?

Thanks for your help!

Yoleusenive