Powershell script stops working when ran through task scheduler - excel

Question

I am running the script below as a scheduled task with the user logged on the server. It converts an xls file to csv using the Excel.Application COM object. The conversion works, but eventually breaks and I don't know why.
I have the task run the following command which should in theory allow it to run constantly:
powershell.exe -noexit -file "filename.ps1"
Any thoughts on what to try?
$server = "\\server"
$xls = "\path\XLS\"
$csv = "\path\CSV\"
$folder = $server + $xls
$destination = $server + $csv
$filter = "*.xls" # <-- set this according to your requirements
$fsw = New-Object IO.FileSystemWatcher $folder, $filter -Property #{
IncludeSubdirectories = $true # <-- set this according to your requirements
NotifyFilter = [IO.NotifyFilters]"FileName, LastWrite"
}
Register-ObjectEvent $fsw Created -SourceIdentifier FileCreated -Action {
$path = $Event.SourceEventArgs.FullPath
$name = $Event.SourceEventArgs.Name
$changeType = $Event.SourceEventArgs.ChangeType
$timeStamp = $Event.TimeGenerated
$excelFile = $folder + $name
$E = New-Object -ComObject Excel.Application
$E.Visible = $false
$E.DisplayAlerts = $false
$wb = $E.Workbooks.Open($excelFile)
foreach ($ws in $wb.Worksheets) {
$n = "output_" + $name -replace ".XLS"
$ws.SaveAs($destination + $n + ".csv", 6)
}
$E.Quit()
}

Answer 1

I was doing something similar with word. I couldnt use Quit alone. I think using Quit hides Excel. Try releasing the com object by using:
$E.Quit()
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($E)
Remove-Variable E
i dont know if you are opening the Excel application but if you are you can maybe use
$wb.close($false)
Let me know if it works...
Ref: https://technet.microsoft.com/en-us/library/ff730962.aspx?f=255&MSPPError=-2147217396