Exchange 2010 Powershell Script error

I have a Powershell script which used to work ....

$OpenSystemsAliasManaged = "OpenSystemsAliasManaged"

$OpenSystemsManagedBy = (Get-Mailbox (Get-DistributionGroup $OpenSystemsAliasManaged).ManagedBy).PrimarySmtpAddress.ToString()

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Now I'm getting following error :-(

Get-Mailbox : Cannot convert 'Microsoft.Exchange.Data.Directory.ADMultiValuedPr
operty`1[Microsoft.Exchange.Data.Directory.ADObjectId]' to the type 'Microsoft.
Exchange.Configuration.Tasks.MailboxIdParameter' required by parameter 'Identit
y'. Specified method is not supported.
At C:\opensystems\RuntimeScripts\ExportScript1.ps1:21 char:37
+ $OpenSystemsManagedBy = (Get-Mailbox <<<<  (Get-DistributionGroup $OpenSystem
    + CategoryInfo          : InvalidArgument: (:) [Get-Mailbox], ParameterBin 
    + FullyQualifiedErrorId : CannotConvertArgument,Microsoft.Exchange.Managem 

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Any idea why?
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ManagedBy is a multi-valued property,   so  you cannot  Get-Mailbox on that.

try   decomposing that

$OpenSystemsManagedBy = @()

foreach($mbox in  (Get-DistributionGroup $OpenSystemsAliasManaged).ManagedBy)
     $OpenSystemsManagedBy +=  (Get-Mailbox $mbox).PrimarySmtpAddress.ToString()

Out-String "Mailbox list: {0} "  -f  ($OpenSystemsManagedBy)
You can try..
$OpenSystemsAliasManaged = "OpenSystemsAliasManaged"

$OpenSystemsManagedBy = (Get-DistributionGroup $OpenSystemsAliasManaged).ManagedBy | % {(Get-mailbox $_).PrimarySmtpAddress.ToString()}

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