Update person/group field in powershell, with a group name

Question

Hi,
I need to update a person column in my library through powershell, I can do this for a single user, but how do update the value to be a sharepoint group?  the column has been set correctly to allow groups, and I can set the group name if I use the browser.
but I cant do it through powershell. I get "Invalid data has been used to update the list item"
Thanks,

Answer 1

Hi Craig,
It seems you are trying to assign Role into people and group column. That's why it is throwing error. Try assigning group into that column.
$web = get-spweb https://mysite/myweb
$groups = $web.Groups
$GroupName = $groups["GroupName"]
foreach($list in $web.Lists)
if($list.BaseType -eq "DocumentLibrary")
$items = $list.Items
foreach ($item in $items)
if($item.File.CheckOutType -eq "None"){
$item.File.CheckOut()
$item["Document Advisor"]= $GroupName
$item.Update()
$item.File.CheckIn("Admin")
Write-Host "updating document: "$item["Title"]
I've tried to modify your code please check it.
Hope this will help to resolve your problem.
Best Regards,
Brij K