Using C# to run PowerShell command to create VirtualDirectory fails

I can run these commands with no problem directly in PowerShell. But trying to get C# to run them, I receive errors.

md d:\ftproot\vdir\test20140317A;
New-WebVirtualDirectory -Site "[site]/[a virt directory]" -Name test20140317A -physicalPath d:\ftproot\vdir\test20140317A;

When running in c# through two different means, I receive these errors

Exception:Caught: "A parameter cannot be found that matches parameter name 'physicalPath'." (System.Management.Automation.CmdletInvocationException)
A System.Management.Automation.CmdletInvocationException was caught: "A parameter cannot be found that matches parameter name 'physicalPath'."

Though in Visual Studio , there's something called InteliTrace and it's showing a whole slew of exceptions starting with

Exception:Thrown: "Unable to load DLL 'wldp.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)" (System.DllNotFoundException)
A System.DllNotFoundException was thrown: "Unable to load DLL 'wldp.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)"

Exception:Thrown: "Requested registry access is not allowed." (System.Security.SecurityException)
A System.Security.SecurityException was thrown: "Requested registry access is not allowed."

Exception:Thrown: "Cannot find path 'C:\Users\jpacella\Documents\WindowsPowerShell\Modules' because it does not exist." (System.Management.Automation.ItemNotFoundException)
A System.Management.Automation.ItemNotFoundException was thrown: "Cannot find path 'C:\Users\jpacella\Documents\WindowsPowerShell\Modules' because it does not exist."

Exception:Thrown: "Could not load file or assembly 'Microsoft.IIS.PowerShell.Framework' or one of its dependencies. The system cannot find the file specified." (System.IO.FileNotFoundException)
A System.IO.FileNotFoundException was thrown: "Could not load file or assembly 'Microsoft.IIS.PowerShell.Framework' or one of its dependencies. The system cannot find the file specified."

Exception:Thrown: "Cannot find path 'C:\Users\jpacella\Documents\WindowsPowerShell\Modules' because it does not exist." (System.Management.Automation.ItemNotFoundException)
A System.Management.Automation.ItemNotFoundException was thrown: "Cannot find path 'C:\Users\jpacella\Documents\WindowsPowerShell\Modules' because it does not exist."

Exception:Thrown: "Process should have elevated status to access IIS configuration data." (System.InvalidOperationException)
A System.InvalidOperationException was thrown: "Process should have elevated status to access IIS configuration data."

Exception:Thrown: "Object reference not set to an instance of an object." (System.NullReferenceException)
A System.NullReferenceException was thrown: "Object reference not set to an instance of an object."

Exception:Thrown: "Cannot find drive. A drive with the name 'IIS' does not exist." (System.Management.Automation.DriveNotFoundException)
A System.Management.Automation.DriveNotFoundException was thrown: "Cannot find drive. A drive with the name 'IIS' does not exist."

Exception:Thrown: "" (System.Management.Automation.ParameterBindingException)
A System.Management.Automation.ParameterBindingException was thrown: ""

Exception:Thrown: "The pipeline has been stopped." (System.Management.Automation.PipelineStoppedException)
A System.Management.Automation.PipelineStoppedException was thrown: "The pipeline has been stopped."

Exception:Thrown: "A parameter cannot be found that matches parameter name 'physicalPath'." (System.Management.Automation.CmdletInvocationException)
A System.Management.Automation.CmdletInvocationException was thrown: "A parameter cannot be found that matches parameter name 'physicalPath'."

These are the two different ways I invoked the script

PowerShell ps = PowerShell.Create();
            ps.AddCommand("New-Item")
                .AddParameter("Path", newPathName)
                .AddParameter("ItemType", "directory");
            ps.AddStatement().AddCommand("New-WebVirtualDirectory")
                .AddParameter("Site", Properties.Settings.Default.VirtualDirectoryPath)
                .AddParameter("Name", userName)
                .AddParameter("physicalPath", newPathName);
                    ps.Invoke();

and (scriptContents is a string holding the

 Runspace runspace = RunspaceFactory.CreateRunspace();
            runspace.Open();

            Pipeline pipeline = runspace.CreatePipeline();
            pipeline.Commands.AddScript(scriptContents);

            pipeline.Commands.Add("Out-String");

            Collection<PSObject> results = pipeline.Invoke();
            runspace.Close();