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
