Error handling Powershell

Hello All,

I've written a script ( just a beginner in Powershell ) for updating manager attribute in AD with a CSV of HR.
But, this CSV isn't up to date. I mean, some users or managers doesn't work anymore for our company.
So some users/managers doesn't exist or are disabled.
So I got errors in my powershell script.

My script:

 $users = import-csv  C:\Users\adm_velvnsar\Downloads\usersmanagers.csv

 ForEach ($user in $users) {
 $displaynameCSV = $user.Name
 $managerCSV = $user.Manager


$CurrentADUsersWithManager = Get-ADUser -filter {DisplayName -like $displaynameCSV} -properties * | Select-Object displayname,manager,SamAccountName 
$GetManagerSamAccountName = Get-ADUser -Filter {DisplayName -like $managerCSV} -Properties * | select-object SamAccountname


    If(!($CurrentADUsersWithManager.manager)) {
        If(!($GetManagerSamAccountName.SamAccountname)) {
            Set-ADUser $CurrentADUsersWithManager.SamAccountName -Manager $GetManagerSamAccountName.SamAccountname

      }
    }
 }

Select allOpen in new window

Maybe my script isn't written well, but it works..
But I want all users that doesn't exist anymore or disabled in a textfile, is it possible?