Can't compile project - VB.Net - Fatal error BC2000 - Xamarin/MonoDevelop - vb.net

Just downloaded Xamarin/MonoDevelop in order to create a VB.Net based cross-platform application.
However Xamarin keeps returning a fatal error when attempting to compile a default template.
Steps:
File > New > Solution
VBNet > Gtk# 2.0 Project
Name solution
Click Play (Debug)
Results:
Error Fatal error BC2000 : compiler initialization failed unexpectedly: Project already has a reference to assembly System. A second reference to 'C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.dll' cannot be added. (Fatal error BC2000 ) (test111)
The above occurs if I click Play, Build, Run/Start Without Debugging, and Run/Start With Debugging.
The above does not occur with a C# Gtk# 2.0 project.
There is only one reference to System within the References folder in the Solution tree.
Any help would be greatly appreciated!
Thanks.

It seems that you can work around this bug if you install Mono and set it as your runtime (Project / Active Runtime menu), then it will build and run successfully.

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Open included solution in WinObjC/build/build.sln
Select Build / Build Solution
1.Download the latest release version
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ps:If using virtual machine(Such as PD),make sure all files storing in Windows folder(such as c:\somewhere) instead of Mac folder (such as \\Mac\Home\Desktop)
3.vs 2015 update1 may alert installing wp8/8.1 tools.
4.Building your Solution( Select Build/Build Solution).

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