Prtg does not get my xml output

Hi Guys,

I do not see what is not correct about this xml output...

This is the code in powershell :

#-----Please adjust to your Exchange server:
$CURI="http://myserver/PowerShell/"
#--------------

Function SizeInBytes ($itemSizeString)
{
    $posOpenParen = $itemSizeString.IndexOf("(") + 1
    $numCharsInSize = $itemSizeString.IndexOf(" bytes") - $posOpenParen 
    $SizeInBytes = $itemSizeString.SubString($posOpenParen,$numCharsInSize).Replace(",","")
	return $SizeInBytes 
}

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri $CURI -Authentication Kerberos
Import-PSSession $Session -DisableNameChecking

$dbs = Get-MailboxDatabase -Status


$result+="<prtg>`r`n"

foreach($db in $dbs)
{
	$dbname=$db.name
	$dbsize=SizeInBytes($db.DatabaseSize)
	$whitespace=SizeInBytes($db.availablenewmailboxspace)

	$edbFilePath = ("\\"+$db.ServerName+"\"+ $db.EdbFilePath.tostring().replace(":","$"))
	$i = $edbFilePath.LastIndexOf('\')
	$edbFilePath = $edbFilePath.Remove($i+1)
	$guid = $db.Guid.ToString()
	$dir = (get-childitem $edbFilePath | where { $_.Name.Contains($guid) })
	$idxdir=$edbFilePath+$dir
	$idxsize=(Get-ChildItem $idxdir | Measure-Object -Property Length -Sum).Sum

	$result+="   <result>`r`n"
	$result+="       <channel>DB-Size "+$dbname+"</channel>`r`n"
	$result+="       <unit>BytesFile</unit>`r`n"
	$result+="       <value>"+$dbsize+"</value>`r`n"
	$result+="   </result>`r`n"
	$result+="   <result>`r`n"
	$result+="       <channel>Whitespace "+$dbname+"</channel>`r`n"
	$result+="       <unit>BytesFile</unit>`r`n"
	$result+="       <value>"+$whitespace+"</value>`r`n"
	$result+="   </result>`r`n"
	$result+="   <result>`r`n"
	$result+="       <channel>Size Index "+$dbname+"</channel>`r`n"
	$result+="       <unit>BytesFile</unit>`r`n"
	$result+="       <value>"+$idxsize+"</value>`r`n"
	$result+="   </result>`r`n"
}		

$result+="</prtg>`r`n"

$result

Exit 0

My result

PS C:\Program Files (x86)\PRTG Network Monitor\Custom Sensors\EXEXML> C:\Program Files (x86)\PRTG Network Monitor\Custom Sensors\EXEXML\Luktdit.ps1

ModuleType Version    Name                                ExportedCommands                                                                                                                    
---------- -------    ----                                ----------------                                                                                                                    
Script     1.0        tmp_0odkiko5.l0w                    {Add-ADPermission, Add-AvailabilityAddressSpace, Add-ContentFilterPhrase, Add-DatabaseAvailabilityGroupServer...}                   
<prtg>
   <result>
       <channel>DB-Size Mailbox Database 1820752587</channel>
       <unit>BytesFile</unit>
       <value>1072275456000</value>
   </result>
   <result>
       <channel>Whitespace Mailbox Database 1820752587</channel>
       <unit>BytesFile</unit>
       <value>24879923200</value>
   </result>
   <result>
       <channel>Size Index Mailbox Database 1820752587</channel>
       <unit>BytesFile</unit>
       <value>1072545885175</value>
   </result>
   <result>
       <channel>DB-Size TestDB</channel>
       <unit>BytesFile</unit>
       <value>114756157440</value>
   </result>
   <result>
       <channel>Whitespace TestDB</channel>
       <unit>BytesFile</unit>
       <value>108396544</value>
   </result>
   <result>
       <channel>Size Index TestDB</channel>
       <unit>BytesFile</unit>
       <value>114933014528</value>
   </result>
   <result>
       <channel>DB-Size NewUsers</channel>
       <unit>BytesFile</unit>
       <value>259981312</value>
   </result>
   <result>
       <channel>Whitespace NewUsers</channel>
       <unit>BytesFile</unit>
       <value>110428160</value>
   </result>
   <result>
       <channel>Size Index NewUsers</channel>
       <unit>BytesFile</unit>
       <value>259981312</value>
   </result>
</prtg>




PS C:\Program Files (x86)\PRTG Network Monitor\Custom Sensors\EXEXML> 

What am i doing wrong?