dfsradmin and ArgumentNullException on Windows Server 2012

Hi, I'm trying to create DFS replication using dfsradmin on windows server 2012

I execute this:

dfsradmin RG New /rgname:NAMESPACE\something /rgdesc:'something replicated'

and it worked OK

then I execute this

dfsradmin RG Set Schedule full /RGName:NAMESPACE\something

and I get :

Unhandled Exception: System.ArgumentNullException: Key cannot be null.
Parameter name: key
   at System.Collections.Hashtable.Remove(Object key)
   at System.DirectoryServices.Protocols.LdapConnection.Dispose(Boolean disposing)
   at System.DirectoryServices.Protocols.LdapConnection.Dispose()
   at Microsoft.RemoteFileSystems.Management.Frs.AdDataProvider.Dispose(Boolean disposing)
   at Microsoft.RemoteFileSystems.Management.Frs.ReplicationManager.Dispose(Boolean disposing)
   at Microsoft.RemoteFileSystems.Management.Frs.FrsConnectionManager.Dispose(Boolean disposing)
   at Microsoft.RemoteFileSystems.Management.DisposableObject.Finalize()

Also there appears a window stating that dfsradmin crashed with details:

 Problem Event Name:    CLR20r3
  Problem Signature 01:    dfsradmin.exe
  Problem Signature 02:    6.2.9200.16384
  Problem Signature 03:    5010771c
  Problem Signature 04:    mscorlib
  Problem Signature 05:    4.0.30319.17929
  Problem Signature 06:    4ffa57ca
  Problem Signature 07:    2043
  Problem Signature 08:    119
  Problem Signature 09:    System.ArgumentNullException
  OS Version:    6.2.9200.2.0.0.272.7
  Locale ID:    1045
  Additional Information 1:    7005
  Additional Information 2:    7005f2ee723291c55d6f5addbc8c1a8c
  Additional Information 3:    4bb3
  Additional Information 4:    4bb3dcb287bfdf07d42c00bbb5d6ba67

when I type

dfsradmin RG list

I can find that Replication Group called NAMESPACE\something exists

Can anyone help me with this problem? I execute the same command on R2 and it works like a charm