Bulk AD User deletion script

Hi There,

i am trying to delete bulk AD user deletion from powershell script but not success and getting below error, please suggest.

Script details

$Users = Import-Csv "D:\Dev\Deleted Users List.csv"

ForEach ($Item in $Users){
  Remove-ADUser -Identity $Item.DistinguishedName -Confirm:$false
  Write-Output "$($Item.Username) - Deleted"

"

Error : 

Remove-ADUser : The directory service can perform the requested operation only on a leaf object
At C:\Users\debendra.desudu\Desktop\Test2.ps1:6 char:3
+   Remove-ADUser -Identity $Item.DistinguishedName -Confirm:$false
+   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (CN=...,DC=local:ADUser) [Remove-ADUser], ADException
    + FullyQualifiedErrorId : ActiveDirectoryServer:8213,Microsoft.ActiveDirectory.Management.Commands.RemoveADUser
 

Thanks,

Debendra