Problem with script that gets directory from ftp server

In the following script the main part that gets the directory (I got this code from the web) works but I can't seem to do anything with the string it returns. The directory is retrieved as a single string named $outputBuffer with each filename separated by a newline character. I split the string into an array and send each array entry to Func-FtpDownLoad with the following result.

Exception calling "DownloadFile" with "2" argument(s): "An exception occurred during a WebClient request."
At \\nasserver\IT\RichardK\Powershell\FTP - Download files.ps1:6 char:25
+     $webclient.DownloadFile <<<< ("ftp://Rich:123456@owserver/$fn", "C:\New folder\$fn")
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

In the code I've called Func-FtpDownLoad twice - the first uses the strings piped from $listArray and causes the exception. The second call uses explicit filenames and works OK.

Also if I change the second argument in DownloadFile to directly name a destination file it also works

$webclient.DownloadFile("ftp://Rich:123456@owserver/$fn", "C:\New folder\TEST.TXT")

But everything gets downloaded as TEST.TXT which isn't much use! - So the problem seems to be something to do with that argument.

Cls

function Func-FtpDownLoad($fn)
{
    $webclient = New-Object System.Net.WebClient
	$webclient.DownloadFile("ftp://Rich:123456@owserver/$fn", "C:\New folder\$fn")
}

# ------------------------- Get FTP directory ------------------------- #

$ftp = [System.Net.WebRequest]::Create("ftp://owserver/")
$ftp.Credentials = New-Object System.Net.NetworkCredential("Rich","123456")

#::ListDirectory will just list the filenames
$ftp.Method = [System.Net.WebRequestMethods+FTP]::ListDirectory #Details

$response = $ftp.getresponse() 
$stream = $response.getresponsestream() 

$buffer = new-object System.Byte[] 1024 
$encoding = new-object System.Text.ASCIIEncoding

$outputBuffer = "" 
$foundMore = $false 

## Read all the data available from the stream, writing it to the 
## output buffer when done. 
do
{
    ## Allow data to buffer for a bit
    start-sleep -m 1000

    ## Read what data is available
    $foundmore = $false
    $stream.ReadTimeout = 1000
	
    do
    {
        try
        {
            $read = $stream.Read($buffer, 0, 1024)

            if($read -gt 0)
            { 
                $foundmore = $true 
                $outputBuffer += ($encoding.GetString($buffer, 0, $read))
            }
        } catch { $foundMore = $false; $read = 0 }
    } while($read -gt 0)
} while($foundmore)

# at this point $outputBuffer is a string with newline separators
# so it looks like this if I display it

# sbserverdns.evt
# sbserverds.evt
# outlook error.JPG

$listArray = $outputBuffer.Split("`n")

# $listArray contains 3 string objects "sbserverdns.evt" "sbserverds.evt" "outlook error.JPG"

# this call fails
$listArray | ForEach-Object {
	Func-FtpDownLoad($_)
}

# this call works using the same filenames as in $listArray
"sbserverdns.evt","sbserverds.evt","outlook error.JPG" | ForEach-Object {
	Func-FtpDownLoad($_)
}