Need help with a script for adding computers to AD Security Group

I have exported all computer names to a .csv file and am trying to add these to a security group

This is the script i am trying to run:

$Computers = Get-Content c:\Temp\clients.csv
foreach ($computer in $computers) {
Add-ADGroupMember -ID "groupname" -Members $computer
}

This is the error i am getting for every computer:

this is a script thats been used earlier to move computers to a new group after removing them from an older group, to update a program used, but it is not working now.

Edit:

Tried running the script like this:

$Computers = Get-Content c:\Temp\clients.csv
foreach ($computer in $computers) {
Add-ADGroupMember -ID "groupname" -Members (Get-ADComputer $computers)
}

Now i get this: