Error publishing C# MVC project, Could not load file or Assembly 'System.Web.Http.Webhost

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I have a C# MVC project, that running in Visual Studio 2013, works, but when I go up to the server gives this error:

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.

Error after solution displayed

Server Error in '/' Application.

Compilation Error

Description: An error occurred During the Compilation of a Resource required to service this request. Please review the following specific error Details and Modify your source code appropriately.

Compiler Error Message: CS0234: The type or namespace name 'Helpers' does not exist in the namespace 'System.Web' (are you Missing an Assembly Reference?)

Line 32:     <pages>
Line 33:       <namespaces>
Line 34:         <add namespace="System.Web.Helpers" />
Line 35:         <add namespace="System.Web.Mvc" />
Line 36:         <add namespace="System.Web.Mvc.Ajax" />
c# asp.net-mvc

  • Which hosting provider? Locaweb, kinghost?

  • smarterasp.net, I have other applications hosted there without any problem. I was having trouble opening the project in two different machines, because I asked for MVC 4.0.0.1 in one and the other had only 4.0.0.0

  • Complete error http://app.sesmt.com.br/

1 answer

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The problem is that the DLL is not being copied to the server when publishing.

Within the project, click References, select that DLL, right-click and Properties. Change the option Copy Local for true and publish the application again.

  • What do you mean by "within the project"? What project? Where would that be? There’s no way to do it in the direct setup on IIS?

  • @franzisk No file csproj. Has, just copy the DLL there, now if it’s a good idea I can no longer guarantee...

  • It is a project that has been copied some files from a system that is in production and placed in a folder on the server and we are trying to go up by configuring directly in IIS (Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3429.0)so I would like to know how to solve directly or on the web.config or IIS dashboard

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