Weird problem with basic New-VM command

Hello,

I am working on a small script to deploy some VM's from a template. I keep getting the following error:

New-VM : 10/02/2012 11:37:04    New-VM        An item with the same key has alr
eady been added.
At C:\scripts\deploy-template.ps1:46 char:7
+ New-VM <<<<  -Name $vmname -Template $template_name -VMHost $destination_host
-Datastore $datastore_name -Confirm:$false
    + CategoryInfo          : NotSpecified: (:) [New-VM], VimException
    + FullyQualifiedErrorId : Core_BaseCmdlet_UnknownError,VMware.VimAutomatio
   n.ViCore.Cmdlets.Commands.NewVM

At the moment I get this error I can see the machine being deployed in vCenter but it seems it wants to deploy another VM and thus spawns the error.

The small script I use:

$vcenter = "vcenter.lab.local"

$vmname = "testing"

$destination_host = "host01.lab.local"

$template_name = "tpl-clean"
$datastore_name = "00-local"

Connect-VIServer -Server $vcenter -Protocol https

New-VM -Name $vmname -Template $template_name -VMHost $destination_host -Datastore $datastore_name

Disconnect-VIServer -Server $vcenter -Confirm:$false

Any help here?