exception - 単純な Try/catch が機能しない

Question

これは私のコードです、それは非常に簡単です：

$TargetFolder = 'M:\'

try{

$Getfolderlist = Get-ChildItem $TargetFolder -Recurse | ? { $_.PSIsContainer -and $_.Name -eq 'old' }

}catch {

Write-Host "Error ! :) "    

}

それは機能せず、powershell 例外が発生します。

Get-ChildItem : Cannot find drive. A drive with the name 'M' does not exist.
At C:\ef-scripts\PurgeDeliveryZip\purge_delivery_zip.ps1:23 char:18
+ $Getfolderlist = Get-ChildItem $TargetFolder -Recurse | ? { $_.PSIsContainer -an ...
+                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (M:String) [Get-ChildItem], DriveNotFoundException
    + FullyQualifiedErrorId : DriveNotFound,Microsoft.PowerShell.Commands.GetChildItemCommand

ご協力いただきありがとうございます。