using MVC 2 instead of MVC1

Hi I was trying to setup atomsite, i dont have MVC 1 on my system, so i changed it to MVC 2 I got his error:

how do I fix it?

 Error  30  Assembly 'AtomSite.WebCore, Version=1.4.0.0, Culture=neutral, PublicKeyToken=null' uses 'System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' w开发者_JS百科hich has a higher version than referenced assembly 'System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' c:\Users\Administrator\Downloads\AtomSite 1.4.0.0 Source\WebCore\bin\AtomSite.WebCore.dll   OpenIdPlugin

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From the error it looks like you do have MVC 1 installed, and thats what you're referencing. The AtomSite.WebCore assembly appears to require MVC 2, but the version of System.Web.Mvc that you've referenced in the project is 1.0.