Why Am I geting an Empty Pipeline Error in this Script - powershell

Question

I'm an extremely novice Powershell student who was given the task of getting the following code to work and I keep getting an Empty Pipeline Error at the line remarked 'Gives Empty Pipeline Error'. After quite a few hours of researching this I am still stumped as to what is causing this. The script is supposed to search the Application.evtx log and return any errors from the last 24 hours. I would greatly appreciate any help that could get me pointed in the right direction.
Here's the code:
#look for Errors script
#Creates Function named CheckLogs
Function CheckLogs()
{
# Defines a named parameter $logfile as a string
param ([string]$logfile)
if(!$logfile) {write-host "Usage: ""C:\Windows\System32\winevt\Logs\Application.evtx"""; exit}
# Accesses the file stored in $logfile variable and looks for the string "ERROR"
cat $logfile | Select-string "ERROR" -SimpleMatch |select -expand line |
foreach
{
$_ -match '(.+)\s\[(ERROR)\]\S(.+)'| Out-Null
new-object psobject -Property#{Timestamp=[datetime]$matches[1];Error=$matches[2]}
| #Gives Empty Pipeline Error
where {$_.timestamp -gt (get-date).AddDays(-1)}
$error_time=[datetime]($matches[1])
if ($error_time -gt (Get-Date).AddDays(-1))
{
write-output "CRITICAL: There is an error in the log file $logfile around
$($error_time.ToShortTimeString( ))"; exit(2)
}
}
write-output "OK: There were no errors in the past 24 hours."
}
CheckLogs "C:\Windows\System32\winevt\Logs\Application.evtx" #Function Call

Answer 1

You can't put the pipe | character on a line by itself. You can end a line with | and then continue the pipeline on the next line though.
This should work:
new-object psobject -Property#{Timestamp=[datetime]$matches[1];Error=$matches[2]} |
where {$_.timestamp -gt (get-date).AddDays(-1)}