Every time I execute this command

invoke-command -computername REMOTEPC -scriptblock { import-module WebAdministration; new-item "$env:systemdrive\inetpub\testsite" -type directory; New-WebSite -Name TestSite -Port 81 -PhysicalPath "$env:systemdrive\inetpub\testsite" }

I get the following error

Invalid class string (Exception from HRESULT: 0x800401F3 (CO_E_CLASSSTRING))
    + CategoryInfo          : NotSpecified: (:) [Get-ChildItem], COMException
    + FullyQualifiedErrorId : System.Runtime.InteropServices.COMException,Microsoft.PowerShell.Commands.GetChildItemCommand

The website is created successfully as far as I can see.

The following command gives the same error when enumerating the testsite

Invoke-Command -computername REMOTEPC { import-module webadministration; dir -path IIS:\Sites\ }

Name             ID   State     Physical Path     Bindings      PSComputerName
Default Web Site 1    Started                     http *:80:    REMOTEPC

Invalid class string (Exception from HRESULT: 0x800401F3 (CO_E_CLASSSTRING))
    + CategoryInfo          : NotSpecified: (:) [Get-ChildItem], COMException
    + FullyQualifiedErrorId : System.Runtime.InteropServices.COMException,Microsoft.PowerShell.Commands.GetChildItemCo
   mmand

Any suggestions would be appreciated