powershell - Add users to Local User Group -

i using following function add users local user group.i need add array of users local group on machine.

function adduserstogroup([string]$machinename,[string]$groupname,[string[]]$userarr) {     write-host 'write: $userarr'     foreach($s in $userarr)     {         write-host $s     }     $objou = [adsi]"winnt://$machinename/$groupname,group"       foreach($user in $userarr)     {         $objou.add("winnt://$machinename/$user,user")     }   }   $userarray=@("administrator", "network service", "local service","system") adduserstogroup -machinename:"localhost" -groupname:"comserver consumer",-userarr:@("administrator", "network service", "local service","system") adduserstogroup -machinename:"localhost" -groupname:"comserver consumer",-userarr:@("administrator", "network service", "local service","system") 

i getting following error:

the following exception occurred while retrieving member "add":
group name not found.

i new powershell. please :)

the issue here

-groupname:"comserver consumer", -userarr 

a comma powershell delimiter array.

the problem had was, seperatet parameters comma, powershell makes space.

take question more informations: how pass multiple parameters function in powershell?

/update

here code

function adduserstogroup([string]$machinename,[string]$groupname,[array]$users) {       $group = [adsi]"winnt://$machinename/$groupname,group"          foreach($user in $users)     {         write-host $user         $group.add("winnt://$user,user")         }   }    [array]$userarray=@("username", "network service", "local service","system") adduserstogroup -machinename "localhost" -groupname "testgroup" -users $userarray 

please try out