我怎样才能修复system.web.dll版本冲突？

I use RazorEngine V 3.0.8 in my project(Asp.net MVC 4) for parsing email template. I use system.web.dll version 1.0.0 in my project. Every thing is ok on my pc as local site and It works. but on server this error was shown:I use RazorEngine V 3.0.8 in my project(Asp.net