New-PSDrive problem

Hi,

I was creating a New-PSDrive to use the Copy-Datastore function in the following way:

$vcServer = Connect-VIServer -Server: -Destination MyDS:\Installer\ -Force

This was working fine for me yesterday but seems to be giving a problem today and I just cant figure why. PLease help. Error listed below

New-PSDrive : Cannot bind parameter 'Datastore' to the target. Exception settin

g "Datastore": "Invalid location type. Location accepts only VIDatastore object

s."

At C:\DOCUME_{1\lahird\LOCALS}1\Temp\7d6a8a2f-c779-4253-a09e-7fcca9341784.ps1:2

char:68

+ New-PSDrive -Name MyDS1 -PSProvider VimDatastore -Root \ -Datastore <<<<  "da

tastore2"

    + CategoryInfo          : WriteError: (, ParameterBindingE

   xception

    + FullyQualifiedErrorId : ParameterBindingFailed,Microsoft.PowerShell.Comm

   ands.NewPSDriveCommand