Add Existing VMDK to New Shared SCSI Controller

Hi

I am working to create a workflow which will created a new shared SCSI controller and will adds the the existing vmdk  to that. But Vcenter throws the following error.

"The device '0' is referring to a

nonexisting controller '1'."

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// To create shared scsi contoller

var configSpec = new VcVirtualMachineConfigSpec();

var deviceConfigSpecs = new Array();

var deviceConfigspec;

var ii=0;

deviceConfigspec = System.getModule("com.vmware.library.vc.vm.spec.config.device").createVirtualScsiControllerConfigSpec_1_ISCSISharing("LSI");

deviceConfigSpecs[ii++]=deviceConfigspec;

configSpec.deviceChange = deviceConfigSpecs;

task = vm.reconfigVM_Task(configSpec);

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// To add existing disk

var backing = new VcVirtualDiskFlatVer2BackingInfo();

backing.fileName = '[Cloud_003] website/website_1.vmdk';

  backing.diskMode = "persistent";

  backing.thinProvisioned = true;

  backing.eagerlyScrub = false;

  backing.writeThrough = false;

  backing.split = false;

var connectable = new VcVirtualDeviceConnectInfo();

connectable.startConnected = true;

connectable.allowGuestControl = false;

connectable.connected = true;

var device = new VcVirtualDisk();

device.key = -100;

device.backing = backing;

device.connectable = connectable;

device.controllerKey = 1;

device.unitNumber = 1;

device.capacityInKB = 1*1024*1024;

var deviceChange = new VcVirtualDeviceConfigSpec();

deviceChange.operation = VcVirtualDeviceConfigSpecOperation.add;

deviceChange.device = device;

var dcArr = [];

dcArr.push(deviceChange);

var spec = new VcVirtualMachineConfigSpec();

spec.deviceChange = dcArr;

vm.reconfigVM_Task(spec);

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Regards,

Deepak.