[MonoDevelop] Why we are getting the gmcs compiler error "The type forwarder for type 'System.TimeZoneInfo' in assembly 'mscorlib' v2.0.0.0, has circular dependency." and the proper way to fix it?

[Frank Chang]

     When I compile a particular C# project using Monodevelop for Ubuntu
Linux 15.10's Build General dropdown list setting of Mono-.NET 4.0, I get
this gmcs compiler error: The type forwarder for type 'System.TimeZoneInfo'
in assembly 'mscorlib' v2.0.0.0, Culture=neutral ,has circular dependency.
    This are the lines of C# source code where the compiler error is
detected.

    List<TimeZoneInfo> ISettingsManager.GetServerTimeZoneList()
     {
            using (var manager = new SettingsManager())
            {
                return manager.GetServerTimeZoneList();
            }
     }

   We would like to know why the monodevelop compile subsytem is
pulling in assembly v2.0.0.0 from the
 Mono-.NET 4.0 build environment.

    The primitive way I fixed the above problem was to compile the specific
C# project using Monodevelop for Ubuntu Linux 15.10's Build General
dropdown list setting of Mono-.NET 4.5.
   I was told this is not the preferred way to fix the gmcs compiler error:
The type forwarder for type 'System.TimeZoneInfo' in assembly 'mscorlib'
v2.0.0.0, Culture=neutral ,has circular dependency.

    I would like to know why we are getting the gmcs compiler error  "The
type forwarder for type 'System.TimeZoneInfo' in assembly 'mscorlib'
v2.0.0.0, Culture=neutral ,has circular dependency." as well as the proper
way to fix it.

   Any help is greatly appreciated.
       Thank you.
           Frank
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