Sharepoint Online Vorgaengerversionen aut. loeschen

# Parameters
$SiteURL = "https://meinedomain.sharepoint.com/sites/UnterseiteName"  
$LibraryName = "????"  

# Function to clear all file versions except the latest one, folder by folder within the library.
Function Cleanup-Versions([Microsoft.SharePoint.Client.Folder]$Folder)
{
    Write-host "Processing Folder:" $Folder.ServerRelativeUrl -f Yellow  

    # Get the Site Relative URL of the folder
    $Folder.ServerRelativeUrl.Replace($Folder.Context.web.ServerRelativeURL,[string]::Empty)

    # Get all files from the folder
    $Files = Get-PnPFolderItem -FolderSiteRelativeUrl $FolderSiteRelativeURL -ItemType File

    # Iterate through each file
    ForEach ($File in $Files)
    {
        # Get file versions
        $Versions = Get-PnPProperty -ClientObject $File -Property Versions
        Write-host -f White "`tScanning File:" $File.Name  

        If ($Versions.Count -gt 1) # Check if there's more than 1 version 
        {
            # Delete all versions except the latest one
            $Versions | Sort-Object -Property Created -Descending | Select-Object -Skip 1 | ForEach-Object {
                $_.DeleteObject()
            }
            Invoke-PnPQuery
            Write-Host -f Green "`t`tPrevious Versions of the File Deleted except the latest:" $File.Name  
        }
    }

    # Get sub-folders from the folder - Exclude "Forms" and hidden folders 
    $SubFolders = Get-PnPFolderItem -FolderSiteRelativeUrl $FolderSiteRelativeURL -ItemType Folder | Where {($_.Name -ne "Forms") -and (-Not($_.Name.StartsWith("_")))}  
    Foreach ($SubFolder in $SubFolders)
    {
        # Call the function recursively
        Cleanup-Versions -Folder $SubFolder
    }
}

# Connect to PnP Online
Connect-PnPOnline -Url $SiteURL -Interactive
$Web = Get-PnPWeb

# Get the root folder of the library
$RootFolder = Get-PnPList -Identity $LibraryName -Includes RootFolder | Select -ExpandProperty RootFolder

# Call the function with the root folder of the library
Cleanup-Versions -Folder $RootFolder

Cleanup-Versions : Die Argumenttransformation für den Parameter "Folder" kann nicht verarbeitet werden. Der Wert   
"Microsoft.SharePoint.Client.Folder" vom Typ "Microsoft.SharePoint.Client.Folder" kann nicht in den Typ   
"Microsoft.SharePoint.Client.Folder" konvertiert werden.  
In Zeile:51 Zeichen:26
+ Cleanup-Versions -Folder $RootFolder
+                          ~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Cleanup-Versions], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Cleanup-Versions