Publishing a Site by Using WebMatrix

Hi 
when i download the project from
http://www.asp.net/web-pages/tutorials/introducing-aspnet-web-pages-2/publishing
and i run it in my vs 2013
i get following errors
how to fix it
Warning 1 The following assembly has dependencies on a version of the .NET Framework that is higher than the target and might not load correctly during runtime causing a failure: System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35. The dependencies are: mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089. You should either ensure that the dependent assembly is correct for the target framework, or ensure that the target framework you are addressin ...