Configuration error: System.Web.Helpers
24,875
Solution 1
Looks like the server on which you deployed the application doesn't have ASP.NET MVC 3 installed. If you do not want to install ASP.NET MVC 3 on the server you could also bin deploy your application.
Solution 2
I had the same problem and i installed ASP.NET MVC 3 Tools Update from Microsoft site and it resolved the problem.
Also check if the C:\Program Files (x86)\Microsoft ASP.NET is present prior to installation. As in my case this folder was missing and post installation i has this folder and assemblies got registered.
Author by
Sachin Kainth
I am a senior C#, .NET and AngularJS developer living in London.
Updated on July 05, 2022Comments
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Sachin Kainth almost 2 years
I deployed a site to a server and I get this error. Why do I get this?
Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: Could not load file or assembly 'System.Web.Helpers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. Source Error: Line 16: <assemblies> Line 17: <add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> Line 18: <add assembly="System.Web.Helpers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> Line 19: <add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> Line 20: <add assembly="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> Source File: C:\<path>\web.config Line: 18 Assembly Load Trace: The following information can be helpful to determine why the assembly 'System.Web.Helpers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' could not be loaded. WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].