Fehler in Powershell: SortAlbumsByGenre per MP3TAG

/add

Command Line Interface
These parameters can be used when starting Mp3tag from the command line:

Start with directory 
Mp3tag.exe /fp:"<full-qualified path to directory>"  

Starts Mp3tag in the specified directory using the directory as working directory.

Start with file 
Mp3tag.exe /fn:"<full-qualified file name>"  

Starts Mp3tag with the specified file using the directory of the file as working directory.

Add directory or file 
/add

Use this in combination with /fp or /fn to add files to the file list. Please note, that files are not automatically sorted when added to the file list.

# Quellordner 
$sourceroot = "d:\Musik\Alben"  
# Ordner nach Genre
$sortedroot = "d:\Musik\sortiert"  
# shell object
$shell = New-Object -Com Shell.Application  
# Ordner nach Genre der ersten MP3 Datei der Ordner gruppieren
$groupedalbums = Get-ChildItem -Path $sourceroot -Directory | group-item {Get-ChildItem $_.Fullname -File -Filter *.mp3 -Recurse | select -First 1 | %{$shell.NameSpace($_.DirectoryName).ParseName($_.Name).ExtendedProperty("System.Music.Genre")}} | ? Name -ne ''  
# Genre Gruppen durchlaufen und in Ordner mit Genre-Name verschieben 
foreach($genre in $groupedalbums){
    # Zielpfad erstellen
    $targetpath = join-path $sortedroot $genre.Name
    # Ordner erstellen falls er noch nicht existiert
    if(!(Test-Path -Path $targetpath -PathType Container)){new-item -type dir -path $targetpath | out-null}
    # Ordner in Zielordner verschieben 
    $genre.Group | move-item -Destination $targetpath -verbose
}