PowerShell to watch a folder and return file counts

KMSigma provided this script as a starting point, but he's gotten busy with other things.  He suggested that I post it here.  Here's the script:

$Folder = "F:\DuckCreek\Insights.Extract.Server\Errorlog\"

$RemotePath = Join-Path -Path "\\${IP}\" -ChildPath $Folder.Replace(":", "$")

$AllFiles = Get-ChildItem -Path $RemotePath | Where-Object { $_.Extension -in ( ".rq", ".rs" ) } | Sort-Object -Property CreationTime

$LastHour = $AllFiles | Where-Object { $_.CreationTime -ge ( Get-Date ).AddHours(-1) }

Write-Host "Message.LastHourCount: $( $LastHour.Count ) file(s) created in the last hour."

Write-Host "Statistic.LastHourCount: $( $LastHour.Count )"

Write-Host "Message.LastHourOldest: $( $LastHour[0].FullName ) is the oldest file in the folder (from the last hour)."

Write-Host "Statistic.LastHourOldest: $( $LastHour[0].CreationTime.ToString("yyyyMMdd") )"

Write-Host "Message.LastHourOldest: $( $AllFiles[0].FullName ) is the oldest file in the folder (from forever)."

Write-Host "Statistic.LastHourOldest: $( $AllFiles[0].CreationTime.ToString("yyyyMMdd") )"

Here's the results that I need help with understanding what the error is:

When I tried running your template and getting the errors below. Can the community review and help?  The overall script/template just needs to run once an hour.

Output: ==============================================
Message.LastHourCount: 0 file(s) created in the last hour.
Statistic.LastHourCount: 0
Message.LastHourOldest: is the oldest file in the folder (from the last hour).
Statistic.LastHourOldest:
Message.LastHourOldest: is the oldest file in the folder (from forever).
Statistic.LastHourOldest:

Errors: ==============================================
Cannot index into a null array.
At line:12 char:40
+ Write-Host "Message.LastHourOldest: $( $LastHour[0].FullName ) is the ...
+ ~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : NullArray

Cannot index into a null array.
At line:13 char:42
+ ... .LastHourOldest: $( $LastHour[0].CreationTime.ToString("yyyyMMdd") )"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : NullArray

Cannot index into a null array.
At line:15 char:40
+ Write-Host "Message.LastHourOldest: $( $AllFiles[0].FullName ) is the ...
+ ~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : NullArray

Cannot index into a null array.
At line:16 char:42
+ ... .LastHourOldest: $( $AllFiles[0].CreationTime.ToString("yyyyMMdd") )"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException
+ FullyQualifiedErrorId : NullArray