help to improve the scrip by adding params

Help me to improve the script by adding param or variables or function. Or perhaps it is OK like that.


So, I have this script which is working. However, I would like to make it more professional and add some param or function to it. So, i tried adding param for group that I want to filter by "TESTSOURCE\DOMAIN Users". As soon as I add param, it doesn't work. Please let me know.

  param(
    [String]$Group='Domain Users',
    [String]$Directory='c:\install'
)

Get-ChildItem $directory -Recurse | ?{ $_.PsIsContainer } | %{
$Path = $_.FullName
 
 (Get-Acl $Path).Access | Select-Object `
    @{n='Path';e={ $Path }}, IdentityReference, AccessControlType, `
    InheritanceFlags, PropagationFlags, FileSystemRights, IsInherited| ?{$_.identityreference.value.ToString() -like $Group}
} | Export-CSV "PermissionsDomainUsers9b.csv"

i get an error:

Get-ChildItem : Access to the path 'C:\Windows\System32\LogFiles\WMI\RtBackup' is denied.
At line:7 char:1
+ Get-ChildItem $directory -Recurse | ?{ $_.PsIsContainer } | %{
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : PermissionDenied: (C:\Windows\Syst...es\WMI\RtBackup:String) [Get-ChildItem], UnauthorizedAccessException
    + FullyQualifiedErrorId : DirUnauthorizedAccessError,Microsoft.PowerShell.Commands.GetChildItemCommand