Powerchell - Error looking for sub OU

I have made  this script:

$startDTM = (Get-Date)

$path = Split-Path -parent "C:\a"



$logdate = Get-Date -Format ddmmyyyy

$userdisableddate = Get-Date

$csvfile = $path + "a\User_Info.csv"
$logfile = $path + "a\$logdate.logfile.txt"
$scriptrunrime = $path + "a\scripttime.txt" 

$ADServer = 'noc'

$GetAdminact = Get-Credential 

Import-Module ActiveDirectory

Function Update-ADUsers {
$Users = Import-Csv -Path $csvfile
$OU =   'ou=smite,ou=dota2,dc=depresion,dc=com','ou=lol,ou=lil,dc=depresion,dc=com' 
ForEach ($User In $Users)
{    $Description = $User."Descripcion"    $Sam = $User."Logon Name"    If ($Sam -And $Description)    {     $OU | Foreach { $UserInAD = Get-ADUser -Server $ADServer  -Credential $GetAdminact -LDAPFilter "(sAMAccountName=$Sam)" -Searchbase $_  -SearchScope OneLevel           If ( $UserInAD ) {                             Set-ADUser -Server $ADServer -Credential $GetAdminact -Identity $Sam -Replace @{Description = $Description}                             } #If                              Else        {         $sam + " Not modified because it doese not exist in AD or LogOn name field is empty on excel file" | Out-File $logfile -Append
}               } #Foreach           }

}
}
Update-ADUsers

$endDTM = (Get-Date)


"Elapsed Time: $(($endDTM-$startDTM).totalseconds) seconds""Elapsed Time: $(($endDTM-$startDTM).totalminutes) minutes"

I get this error: 

Get-ADUser : No se encuentra el objeto de directorio
En C:\a\2053.ps1: 44 Carácter: 34
+      $OU | Foreach { $UserInAD = Get-ADUser -Server $ADServer  -Credential $GetA ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~    + CategoryInfo          : ObjectNotFound: (:) [Get-ADUser], ADIdentityNotFoundException    + FullyQualifiedErrorId : ActiveDirectoryCmdlet:Microsoft.ActiveDirectory.Management.ADIdentityNotFoundException,Microsoft.Activ    eDirectory.Management.Commands.GetADUser

How can I solve it? Thanks.