VS2010 StyleCop与CA1017 ComVisible相关的错误

Error   18  CA1017 : Microsoft.Design : 
Because \'NationalInstruments.Labview.FPGA.ModelsimCommunicator.dll\' exposes externally 
visible types, mark it with ComVisible(false) at the assembly level and then mark all 
types within the assembly that should be exposed to COM clients with ComVisible(true).

Error   19  The type or namespace name \'ComVisible\' could not be found (are you 
missing a using directive or an assembly reference?)    


Error   20  The type or namespace name \'ComVisibleAttribute\' could not be found (are
you missing a using directive or an assembly reference?)    

[assembly: System.Runtime.InteropServices.ComVisible(false)]

using System.Runtime.InteropServices;