Adding new SCSI controller: "Fault string: Invalid operation for device '0'."

Hello,

I have an issue when I try to add a SCSI controller to a virtual machine.

I have this error:

Fault string: Invalid operation for device '0'.

Fault detail: InvalidDeviceOperation

Here is my code:

my $info = Description->new(label => "SCSI Controller 2", summary => "LSI Logic Parallel");

my $controller = VirtualLsiLogicController->new(

                deviceInfo => $info,

                scsiCtlrUnitNumber => '7',

                sharedBus => VirtualSCSISharing->new('noSharing'),

                busNumber => -1,

                key => -1,

                backing => $backing_info,

                controllerKey => 100,

                );

my $devspec = VirtualDeviceConfigSpec->new(operation => VirtualDeviceConfigSpecOperation->new('add'),

                device => $controller ,

                fileOperation => VirtualDeviceConfigSpecFileOperation->new('create'),

                );

my $vmspec = VirtualMachineConfigSpec->new(deviceChange => [$devspec] );

eval {

        $vm_view->ReconfigVM( spec => $vmspec );

        Util::trace(0,"Controller has been created.\n");

};

I don't know how to handle it, or even how to troubleshoot.

Any ideas would be greatly appreciated.

Regards,

Jeremy