Scripting

I have a script that would copy a folder, rename the new folder and then add the proper permissions to the new folder. This script worked flawlessly for a year then all of a sudden it stopped adding the permissions. I keep getting 

    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException

    + FullyQualifiedErrorId : IdentityNotMappedException

I am including the script below, Any help will be greatly appreciated

$NewUser = Read-Host "Enter Name"

Copy-Item \\ComputerName\Profiles\Template \\ComputerName\Profiles\$NewUser -Recurse

$identity = "Domain\$NewUser"

$rights = 'FullControl' 

$inheritance = 'ContainerInherit, ObjectInherit'

$propagation = 'None'

$type = 'Allow'

$ACE = New-Object System.Security.AccessControl.FileSystemAccessRule($identity,$rights,$inheritance,$propagation,$type)

$ACL = Get-Acl -Path "\\ComputerName\Profiles\$NewUser"

$ACL.AddAccessRule($ACE)