VCAC Designer Microsoft.Data.Services.Client assembly missing after upgrade to 6.1

Hi

On the IaaS server VCAC Designer  I am using the following VB expression to get the machine object for vmname and pass the variable  to orchestrator workflow. This was working fine on vcac 6.0.1

machine = mgmtContext.VirtualMachines.Where(Function (vm) vm.VirtualMachineID = virtualmachineId).FirstOrDefault();

After the upgrade to VCAC 6.1 I'm getting the following missing assembly error:

Reference required to assembly 'Microsoft.Data.Services.Client, Version=5.6.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' containing the base class 'System.Data.Services.Client.DataServiceContext'

Does anyone know a fix?

Thanks,

Deepak M.