Powershell script check for files and log

Basically this is it
if ((Test-Path $firstfile) -and (Test-Path $secondfile) -and (Test-Path $Thirdfile)) {
  Yourcodehere
} else { break }

I am getting error and given below complete script, error msg and log.

Actually I want to check if 3 files exists..
If exists it should write the filename with path in the log file.
if not exists then should write missing file in the log and exit.
can help pls..



#Requires -version 3.0
$WarningPreference="Continue"

#variables
$ScriptPath = $(Split-Path -Parent $MyInvocation.MyCommand.Definition)

#Log Timestamp
$date=Get-Date -Format ddMMMyyyyHHmmss
$logdate=Get-Date -Format ddMMMyyyy_HHmmss
$Logfile = "E:\INT\LOG\FileProcessing_$logdate.txt"

function LogWrite ([string]$logstring)
{  
   Add-content $Logfile -value $logstring
}
LogWrite ("$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) START:`t"+"File Processing of XML`n")

#Zip Files and move to backup folder
$sourcefolder="E:\INT\PUT"
$backupFolder="E:\INT\Archive"

#check if source folder exists
if(!(Test-Path $sourcefolder)){
    $msj="The source folder ""$($sourcefolder)"" doesn't exists. Exiting..."
    LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) ERROR:`t$msj"
    LogWrite -ForegroundColor Red $msj
    exit -1
}

#check if source file exists
if ((Test-Path $cat.xml) -and (Test-Path $rat.xml) -and (Test-Path $bat.xml)) {
    $msj="The source files ""$($sourcefolder)"" doesn't exists. Exiting..."
    LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) ERROR:`t$msj"
    LogWrite -ForegroundColor Red $msj
    exit -1
}

#check the target folder or create it
if(!(Test-Path $backupFolder)){
    $msj="The target folder ""$($backupFolder)"" was created"
    LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) EXECUTE:`t$msj"
    LogWrite -ForegroundColor Magenta $msj
    New-Item -ItemType Directory -Path $backupFolder | Out-Null
}

foreach($file in (Get-ChildItem -File $sourcefolder -Filter "*.xml" -Recurse)){
    $date = Get-date -Format "ddMMyyyy_HHmmss"
    $destinationFile = "$($FILE.Directory.FullName)\$($file.Name).zip"
    $MoveFile = "$backupFolder\$($file.BaseName)_$date.xml"
    try{
        $msj="Compressing File ""$($file.Name)"" into ""$destinationFile"" succeeded"
        Compress-Archive -Path $($file.FullName) -CompressionLevel Optimal -DestinationPath  $destinationFile -Force
        LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) COMPRESS:`t$msj"

        #successful compress
        $msj="Moving File ""$MoveFile"""
        Move-Item -Path $($file.FullName) -Destination $MoveFile -Force
        LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) ARCHIVE:`t$msj"
    }  

    catch{
        $msj="There was an Error: $($_.exception.Message)"
        LogWrite "$( Get-Date -Format "yyyy-MM-dd HH:mm:ss" ) ERROR:`t$msj"
        LogWrite -ForegroundColor Red $msj
        exit -1
    }
}

exit 0

**********************************************************************************

I get this error msg .

PS E:\INT> E:\INT\FileCheck_Revise.ps1
Test-Path : Cannot bind argument to parameter 'Path' because it is null.
At E:\INT\FileCheck_Revise.ps1:31 char:16
+ if ((Test-Path $cat.xml) -and (Test-Path $rat.xml) -and (Test-Path $b ...
+                ~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Test-Path], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.TestPathCommand
 PS E:\INT>

**********************************************************************************

Log file output

2018-09-18 17:09:46 START:      File Processing of XML
2018-09-18 17:09:49 COMPRESS:      Compressing File "bat.xml" into "E:\INT\PUT\bat.xml.zip" succeeded
2018-09-18 17:09:49 ARCHIVE:      Moving File "E:\INT\Archive\bat_18092018_170946.xml"
2018-09-18 17:09:49 COMPRESS:      Compressing File "cat.xml" into "E:\INT\PUT\cat.xml.zip" succeeded
2018-09-18 17:09:49 ARCHIVE:      Moving File "E:\INT\Archive\cat_18092018_170949.xml"
2018-09-18 17:09:49 COMPRESS:      Compressing File "rat.xml" into "E:\INT\PUT\rat.xml.zip" succeeded
2018-09-18 17:09:49 ARCHIVE:      Moving File "E:\INT\Archive\rat_18092018_170949.xml"

I used variables, if you use filenames do not prepend the $

Hi Michael ,
thanks for help..
it works.