Using Powershell to Update "manager" attribute in AD

Hello,

I have a csv file that I use this to update all the AD attributes.

The CSV file looks like this:
EmployeeID,Title,managerID,Department,physicalDeliveryOfficeName,StreetAddress,L,ST,postalCode
11111,Engineer,22222,My Department,"111 main st., Suite 105",somecity,MD,22244

Below is the script I use to update the AD attributes:
Import-Module ActiveDirectory
Import-Csv update.csv | ForEach `
{
$mgr=Get-ADUser -LDAPFilter "(employeeID=$_.managerID)" | Select -ExpandProperty DistinguishedName
Get-ADUser -LDAPFilter "(employeeID=$_.employeeID)" -properties * |Set-ADUser -replace @{title=$title;manager=$mgr}
}

If I remove manager=$mgr the script works with no problems.

If I put it back it fails with error message:
----------------------------------------------------------------------------------------------------------------------------
Set-ADUser : Cannot bind parameter 'Replace' to the target. Exception setting "
Replace": "Object reference not set to an instance of an object."
At C:\temp\ad\userInfo.ps1:16 char:91
+     Get-ADUser -LDAPFilter "(employeeID=$_.employeeID)" -properties * |Set-AD
User -replace <<<<  @{title=$title;manager=$mgr}
    + CategoryInfo          : WriteError: (:) [Set-ADUser], ParameterBindingEx
   ception
    + FullyQualifiedErrorId : ParameterBindingFailed,Microsoft.ActiveDirectory
   .Management.Commands.SetADUser
-------------------------------------------------------------------------------------------------------------------------------

I tried putting quotes around $mgr but it still did not work.  
The weird part is if I type one by one on the powershell window it works fine.

Any ideas what the issue could be?

Thanks!
mhmservicesAsked:
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footechCommented:
I don't know why it's different here, but the following works for me.  It seems that it is not detecting the variable as a string properly when trying to set the manager attribute.  I don't see the same issue when setting the title.
Get-ADUser -LDAPFilter "(employeeID=$_.employeeID)" -properties * |Set-ADUser -replace @{title=$title;manager="$mgr"}
# as does
Get-ADUser -LDAPFilter "(employeeID=$_.employeeID)" -properties * |Set-ADUser -replace @{title=$title;manager=[string]$mgr}

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footechCommented:
Also, you can just use the -manager parameter without issue.
Get-ADUser -LDAPFilter "(employeeID=$_.employeeID)" -properties * | Set-ADUser -manager $mgr

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mhmservicesAuthor Commented:
Thanks, it worked.
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