Powershell Setting Share Folder Permissions

Question

I have a script that create a shared folder and I am trying to set permissions. Here is what I have so far:
$serverName = "myfileserver"
$folderName = "d:\Personal"
$shareName = $newSAM+"$"
$fullName = "\\$serverName\"+$folderName.Replace(":", "$")+"\$newSAM"
# Creating the Directory
$finalResult = New-Item $fullName -type directory
$trustee = ([wmiclass]"Win32_trustee").psbase.CreateInstance()
$trustee.Domain = "domain.com"
$trustee.Name = $newSAM
$ace = ([wmiclass]"Win32_ACE").psbase.CreateInstance()
$ace.AccessMask = 2032127
$ace.AceFlags = 3
$ace.AceType = 0
$ace.Trustee = $trustee
$trustee2 = ([wmiclass]"Win32_trustee").psbase.CreateInstance()
$trustee2.Domain = "domain.com"
$trustee2.Name = "administrator"
$ace2 = ([wmiclass]"Win32_ACE").psbase.CreateInstance()
$ace2.AccessMask = 2032127
$ace2.AceFlags = 3
$ace2.AceType = 0
$ace2.Trustee = $trustee2
$trustee3 = ([wmiclass]"Win32_trustee").psbase.CreateInstance()
$trustee3.Domain = $serverName
$trustee3.Name = "administrator"
$ace3 = ([wmiclass]"Win32_ACE").psbase.CreateInstance()
$ace3.AccessMask = 2032127
$ace3.AceFlags = 3
$ace3.AceType = 0
$ace3.Trustee = $trustee3
$sd = ([wmiclass]"Win32_SecurityDescriptor").psbase.CreateInstance()
$sd.ControlFlags = 4
$sd.DACL = $ace, $ace2, $ace3
$sd.group = $trustee3
$sd.owner = $trustee3
# Creating the Folder Share
$finalResult = Invoke-WmiMethod -Class win32_share -name Create -ArgumentList @($sd,"",4294967295,$shareName,"","$folderName\$newSAM",0) -computername $serverName
The folder is created correctly but I am getting this error when setting permissions: 
Exception setting "DACL": "Unable to cast object of type 'System.Management.Automation.PSObject' to type 'System.Manage
ment.ManagementBaseObject'."

Answer 1

I am testing it against a remote 2003 R2 SP2 server...
I have upgraded to Powershell v3 in my frustation (although I would rather have worked with the default like our helpdesk folks who will be running this - now we have to install this on all their machines)... Anyway...
I do not get any more errors when I run it, but it still does not add and share permissions... All it had is 'Everyone' as the sole group in the Permissions area...
Here again is the code I ran:
$serverName = "myServer"
$folderName = "d:\Users"
$shareName = $newSAM+"$"
$fullName = "\\$serverName\"+$folderName.Replace(":", "$")+"\$newSAM"
# Creating the Directory
$finalResult = New-Item $fullName -type directory
# AccessMasks:
# 2032127 = Full Control
# 1245631 = Change
# 1179817 = Read
$trustee = ([wmiclass]"Win32_trustee").psbase.CreateInstance()
$trustee.Domain = "domain"
$trustee.Name = "administrator"
$ace = ([wmiclass]"Win32_ACE").psbase.CreateInstance()
$ace.AccessMask = 2032127
$ace.AceFlags = 3
$ace.AceType = 0
$ace.Trustee = $trustee
$trustee2 = ([wmiclass]"Win32_trustee").psbase.CreateInstance()
$trustee2.Domain = "BUILTIN"  #Or domain name
$trustee2.Name = "Administrators"
$ace2 = ([wmiclass]"Win32_ACE").psbase.CreateInstance()
$ace2.AccessMask = 2032127
$ace2.AceFlags = 3
$ace2.AceType = 0
$ace2.Trustee = $trustee2
$trustee3 = ([wmiclass]"Win32_trustee").psbase.CreateInstance()
$trustee3.Domain = "domain"
$trustee3.Name = $newSAM
$ace3 = ([wmiclass]"Win32_ACE").psbase.CreateInstance()
$ace3.AccessMask = 2032127
$ace3.AceFlags = 3
$ace3.AceType = 0
$ace3.Trustee = $trustee3
$sd = ([wmiclass]"Win32_SecurityDescriptor").psbase.CreateInstance()
$sd.ControlFlags = 4
$sd.DACL = [System.Management.ManagementBaseObject[]] ($ace, $ace3)
$sd.group = $trustee2
$sd.owner = $trustee2
# Creating the Folder Share
$finalResult = Invoke-WmiMethod -Class win32_share -name Create -ArgumentList @($sd, "", 4294967295, $shareName, "", "$folderName\$newSAM", 0) -computername $serverName -EnableAllPrivileges
I will change this manually so that I perform this on my laptop and report what results I get....