I'm getting this exception:

System.ArgumentNullException: Value cannot be null.
Parameter name: format
at System.String.Format(IFormatProvider provider, String format, Object[] args)
at Intel.Healthcare.Device.Buttons..ctor(IntPtr windowHandle)
at xxx.frmScan..ctor()

My code at that point looks like:

using Intel.Healthcare;
using Intel.Healthcare.Device;
using Intel.Healthcare.Exception;

Buttons btn;
EventHandler mRfidScannedHand = null;

public frmScan()
{
InitializeComponent();
btn = new Buttons(this.Handle);
mRfidScannedHand = new EventHandler(mBtn_RfidScanned);
}

Any ideas on what I'm doing wrong?