svmotion script wait-task error

I'm trying to get a script to work that will svmotion all machines listed in folder to a new datastore cluster and new host (which are in a separate cluster) once the migration is completed, power on the vm.

The error I'm getting

Wait-Task : Cannot validate argument on parameter 'Task'. The argument is null or empty. Supply an argument that is not null or empty and then try the command again.

At C:\temp\svmotion\final.ps1:11 char:18

+         Wait-Task -Task <<<<  $task

    + CategoryInfo          : InvalidData: (:) [Wait-Task], ParameterBindingValidationException

    + FullyQualifiedErrorId : ParameterArgumentValidationError,VMware.VimAutomation.ViCore.Cmdlets.Commands.WaitTask

Here is my script

#Import Plugins and Connect to vCenter

Add-PSSnapin VMware.VimAutomation.Core

$creds = Get-Credential

$viserver = Read-Host "vCenter Server:"

Connect-VIServer -Server $viserver -Credential $creds

 

 

 

# Get a List of VM's from the relocation folder

$vmlist = get-vm -location "relocateme"

 

 

 

#Stoage vMotion each VM in selected cluster in a staged fashion

foreach($vm in $vmlist)

{

  Write-Host Relocating..."$vm"

  $task = Get-VM -Name $vm.Name | Move-VM -Datastore "Test Datastore" -Destination VMHOST1.NET

  Wait-Task -task $task

  Start-VM $vm.name

}

Once the script has exited get-vm -location "relocateme" shows the VM listed, however write-host $vmlist and write-host $vm both contain no data.

If I do write-host $task it is also blank. What am I missing?

The names of our VM's are long and contain special characters. Could this be the problem?. An example machine name is "AA-BB-CC-DD (Test Machine for Migrations)[T][+]"  (excluding the commas).

I'm using Powercli 5.1

Any help would be greatly appreciated.