Powershell - NTFS Berechtigungen Konvertierungsfehler bei Invoke-Command

################################
# - FUNCTION Choose config -   #
################################

function Read-OpenFileDialog([string]$WindowTitle, [string]$InitialDirectory, [string]$Filter = "All files (*.*)|*.*", [switch]$AllowMultiSelect)  

    {
    $openFileDialog = New-Object System.Windows.Forms.OpenFileDialog
    $openFileDialog.Title = $WindowTitle
    if (![string]::IsNullOrWhiteSpace($InitialDirectory)) { $openFileDialog.InitialDirectory = $InitialDirectory }
    $openFileDialog.Filter = $Filter
    if ($AllowMultiSelect) { $openFileDialog.MultiSelect = $true }
    $openFileDialog.ShowHelp = $true    # Without this line the ShowDialog() function may hang depending on system configuration and running from console vs. ISE.
    $openFileDialog.ShowDialog() > $null
    if ($AllowMultiSelect) { return $openFileDialog.Filenames } else { return $openFileDialog.Filename }
    }

####################################
# - END FUNCTION Choose config -   #
####################################
$xml = Read-OpenFileDialog -WindowTitle "Select Config File" -InitialDirectory 'C:\' -Filter "XML Files (*.xml)|*.xml"  
[xml]$ConfigFile = Get-Content $xml
$cred = Get-Credential

####################################
# - Admin User for Folder Rights - #
####################################

$AdminUser = @{
    Account = $ConfigFile.Settings.User.Admin
    }

########################################
# - END Admin User for Folder Rights - #
########################################

####################################
# - FUNCTION Delete User Profile - #
####################################
function delUserProfile
{
Begin
  {
        Log-Write -LogPath $LogFile -LineValue "###################################"  
        Log-Write -LogPath $LogFile -LineValue "# Deleting User Roaming Profiles: #"  
        Log-Write -LogPath $LogFile -LineValue "###################################"  
  }
Process
{
Try
    {
         
         IMPORT-CSV $DropDownDelUserProfile.SelectedItem.FullName |
         ForEach-Object{
         
         $outputbox.Text +="`r`n"  
         $outputBox.text += Invoke-Command @ServerSettings -Credential $cred -ArgumentList ($_,$RDFSettings,$RPFSettings,$AdminUser) -ScriptBlock{
         Param($User,$RDF,$RPF,$AdminUser)
         ("User entfernt: "+$user.SamAccountName)  
         $profilePath = $RDF.Item("Path") + $user.SamAccountName  
         $profilePath2 = $RPF.Item("Path") + $user.SamAccountName + ".V2"  
         Add-NTFSAccess -Path $profilePath -AccessRights FullControl -Account $AdminUser
         Remove-Item -Path $profilePath -Recurse -Force
         Remove-Item -Path $profilePath2 -Recurse -Force
        } -ErrorAction SilentlyContinue -ErrorVariable ErrDelProfile
         #Log $ErrDelProfile     
      }
    }
catch
    {
     Log-Error -LogPath $LogFile -ErrorDesc $_.Exception -ExitGracefully $True
     Break
    }
}
End
    {
      If($?){
        Log-Write -LogPath $LogFile -LineValue " "  
        Log-Write -LogPath $LogFile -LineValue $outputBox.Text
        Log-Write -LogPath $LogFile -LineValue $ErrDelProfile
        Log-Write -LogPath $LogFile -LineValue " "  
        Log-Write -LogPath $LogFile -LineValue "finished Process"  
        Log-Write -LogPath $LogFile -LineValue "----------------"  
        Log-Write -LogPath $LogFile -LineValue " "  
              }
  }
}