在Visual Studio 2012中，我创建了一个ASP.NET MVC 4项目，目标框架是.NET Framework 4.5。当我将项目部署到Web服务器时，会出现以下错误：
- Could not load file or assembly 'System.Web.Http.WebHost,Version=4.0.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file
- specified.
- Description: An unhandled exception occurred during the execution of the current web request.
- Please review the stack trace for more information about the error and where
- it originated in the code.
- Exception Details: System.IO.FileNotFoundException: Could not load file or
- assembly 'System.Web.Http.WebHost,PublicKeyToken=31bf3856ad364e35' or one of its dependencies.
- The system cannot find the file specified.
- Source Error:
- Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34237
