PowerShell Script Error in command but works in ISE - powershell

Question

I am running a script in the ISE that essentially downloads a file from a public site:
#This PowerShell code scrapes the site and downloads the latest published file.
Param(
$Url = 'https://randomwebsite.com',
$DownloadPath = "C:\Downloads",
$LocalPath = 'C:\Temp',
$RootSite = 'https://publicsite.com',
$FileExtension = '.gz'
)
#Define the session cookie used by the site and automate acceptance. $session = New-Object Microsoft.PowerShell.Commands.WebRequestSession
$cookie = New-Object System.Net.Cookie
$cookie.Name = "name"
$cookie.Value = "True"
$cookie.Domain = "www.public.com"
$session.Cookies.Add($cookie);
$FileNameDate = Get-Date -Format yyyyMMdd
$DownloadFileName = $DownloadPath + $FileNameDate + $FileExtension
$DownloadFileName
TRY{
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$WebSite = Invoke-WebRequest $Url -WebSession $session -UseBasicParsing #this gets the links we need from the main site.
$Table = $WebSite.Links | Where-Object {$_.href -like "*FetchDocument*"} | fl href #filter the results that we need.
#Write-Output $Table
$FilterTable=($Table | Select-Object -Unique | sort href -Descending) | Out-String
$TrimString = $FilterTable.Trim()
$FinalString = $RootSite + $TrimString.Trim("href :")
#Write-Verbose $FinalString | Out-String
#Start-Process powershell.exe -verb RunAs -ArgumentList "-File C:\some\path\base_server_settings.ps1" -Wait
Invoke-WebRequest $FinalString -OutFile $DownloadFileName -TimeoutSec 600
$ExpectedFileName = Get-ChildItem | Sort-Object LastAccessTime -Descending | Select-Object -First 1 $DownloadPath.Name | SELECT Name
$ExpectedFileName
Write-Host 'The latest DLA file has been downloaded and saved here:' $DownloadFileName -ForegroundColor Green
}
CATCH{
[System.Net.WebException],[System.IO.IOException]
Write "An error occured while downloading the latest file."
Write $_.Exception.Message
}
Expectation is that it downloads a file into the downloads folder and does in fact download the file when using the ISE.
When I try to run this as a command however (PowerShell.exe -file "/path/script.ps1) I get an error stating:
An error occurred while downloading the latest file. Operation is not valid due to the current state of the object.
out-lineoutput : The object of type
"Microsoft.PowerShell.Commands.Internal.Format.GroupEndData" is not
valid or not in the correct sequence. This is likely caused by a
user-specified "format-*" command which is conflicting with the
default formatting. At
\path\to\file\AutomatedFileDownload.ps1:29
char:9
$FilterTable=($Table | Select-Object -Unique | sort href -Des ...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CategoryInfo : InvalidData: (:) [out-lineoutput], InvalidOperationException
FullyQualifiedErrorId : ConsoleLineOutputOutOfSequencePacket,Microsoft.PowerShell.Commands.OutLineOutputCommand
I found several articles describing using the MTA or STA switch and I have tried to add in -MTA or -STA to the command, but it still gives me the same error in the command.

Answer 1

As commented, you are trying to get one link from the website, but pipe your commande to things like Format-List and Out-String, rendering the result to either nothing at all or as a single multiline string.. In both cases, this won't get you what you are after.
Not knowing the actual values of the linksof course, I suggest you try this:
Param(
$Url = 'https://randomwebsite.com',
$DownloadPath = "C:\Downloads",
$LocalPath = 'C:\Temp',
$RootSite = 'https://publicsite.com',
$FileExtension = '.gz'
)
# test if the download path exists and if not, create it
if (!(Test-Path -Path $DownloadPath -PathType Container)){
$null = New-Item -Path $DownloadPath -ItemType Directory
}
#Define the session cookie used by the site and automate acceptance.
$session = New-Object Microsoft.PowerShell.Commands.WebRequestSession
$cookie = New-Object System.Net.Cookie
$cookie.Name = "name"
$cookie.Value = "True"
$cookie.Domain = "www.public.com"
$session.Cookies.Add($cookie);
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
try {
$WebSite = Invoke-WebRequest -Uri $Url -WebSession $session -UseBasicParsing -ErrorAction Stop #this gets the links we need from the main site.
# get the file link
$lastLink = ($WebSite.Links | Where-Object {$_.href -like "*FetchDocument*"} | Sort-Object href -Descending | Select-Object -First 1).href
# create the file URL
$fileUrl = "$RootSite/$lastLink"
# create the full path and filename for the downloaded file
$DownloadFileName = Join-Path -Path $DownloadPath -ChildPath ('{0:yyyyMMdd}{1}' -f (Get-Date), $FileExtension)
Write-Verbose "Downloading $fileUrl as '$DownloadFileName'"
Invoke-WebRequest -Uri $fileUrl -OutFile $DownloadFileName -TimeoutSec 600 -ErrorAction Stop
# test if the file is downloaded
if (Test-Path -Path $DownloadFileName -PathType Leaf) {
Write-Host "The latest DLA file has been downloaded and saved here: $DownloadFileName" -ForegroundColor Green
}
else {
Write-Warning "File '$DownloadFileName' has NOT been downloaded"
}
}
catch [System.Net.WebException],[System.IO.IOException]{
Write-Host "An error occured while downloading the latest file.`r`n$($_.Exception.Message)" -ForegroundColor Red
}
catch {
Write-Host "An unknown error occured while downloading the latest file.`r`n$($_.Exception.Message)" -ForegroundColor Red
}