Using GHI.Premium.Hardware; -> 'System.Exception' in Microsoft.SPOT.Hardware.dll

Hi,
In a program in c sharp for my Fez Cobra II, I wanted to use the concept RealClockTime. So I installed the proper libraries and references added to the program goes well.
Before I had:
using System;
using Microsoft.SPOT.Hardware;
using System.IO.Ports;
using GHI.Hardware.FEZCerb;
using System.Text;
using System.Threading;
using Microsoft.SPOT;

and so I now this:
using System;
using Microsoft.SPOT.Hardware;
using System.IO.Ports;
using GHI.Hardware.FEZCerb;
using GHI.Premium.Hardware;
using System.Text;
using System.Threading;
using Microsoft.SPOT;

Except that it makes me an exeption: An unhandled exception of type ‘System.Exception’ occurred in Microsoft.SPOT.Hardware.dll

And this is only the addition of using this GHI.Premium.Hardware;

Why? ^ ^

Hi,
I think it has to do with the Statements

using GHI.Hardware.FEZCerb;

or

using Microsoft.SPOT.Hardware

I think the first is not needed since Cobra II does not belong to the Cerb Family
and there may be members with the same Name.

Thank you for the answers,
for andre.m: it does not work
for RoSchmi and others: yes I’m stupid, it’s a FEZ Cerb40 ii

The Cerb, at the present time, does not use the Premium library. It uses the OSHW library.

References should be to GHI.OSHW.Hardware

Thank you !
Now it works.