Error when enabling Active Directory Recycle Bin

Hello,

i tried to enable Active directory recycle bin with this command :
Enable-ADOptionalFeature –Identity ‘CN=Recycle Bin Feature,CN=Optional Features,CN=Directory Service,CN=Windows NT,CN=Services,CN=Configuration, DC=toto,DC=fr‘ –Scope ForestOrConfigurationSet –Target ‘toto.fr‘

but i have this error :

Enable-ADOptionalFeature:areferencehas beenreturned by the server

At line:1 char:25

+Enable-ADOptionalFeature <<<<  -Identity ‘CN=Recycle Bin Feature,CN=Optional Features,CN=Directory Service, CN=Windows NT,CN=Services,CN=Configuration,DC=contoso,DC=com’ –Scope ForestorConfigurationSet –Target ‘toto.fr’

  +CategoryInfo          : NotSpecified: (CN=Recycle Bin ..=toto,DC=fr:ADOptionalFeature) [Enable-ADOptionalFeature], ADException

  + FullyQualifiedErrorID : The specified method is not supported,Microsoft.ActiveDirectory.Manegment.Commands.EnableADOptionalFeature

i am already in forest win 2008 R2 and domain win 2008R2
If i try (Get-ADDomain).DomainMode or (Get-ADForest).ForestMode, i have always windows2008R2

i try also this command : Enable-ADOptionalFeature "recycle bin feature" -Scope ForestOrConfigurationSet -Target "toto.fr"  and same problem

what the problem ?

thanks