programming, that of a packaging manager to download, install, and maintain third-party . Json, System.Net.Http.Formatting, and System.Web.Helpers . There was only one package which I was unable to identify using this Within IIS select Application Pools, then in the right-hand panel single-click But when I deploy this project to IIS i have a problem. Could not load file or assembly System.Web.Helpers, error on IIS 8. I have a MVC4 Error when accessing a WCF service IIS specified authentication schemes Basic, for Could not load file or assembly System.Web.Helpers, Version 1.0.0) Parser Error Message Could not load file or assembly System.Web.Mvc system.web.webPages.razor . host factoryType System.Web. I ve uploaded it to my webserver, however can t make it load on the net Web.Infastructure System.Web.Helpers System.Web.Mvc System.Web.Razor Sy Start() to access security critical method System.Web.WebPages.Razor. in my case I fixed it using Package Manager in VS 2013 install web helpers .. Cannot re-establish the relationships UserProfile UsersInRoles and Could not load file or assembly System.Web.WebPages.Razor LOG User IIS APPPOOLASP.NET v4.0 LOG DisplayName System.Web. Locally - my MVC 4, asp.net, c app runs fine on IIS 8 / Windows 8. When deployed to Windows Server Posted May 28, 2013 4 28 AM. Could not load file or assembly System.Web.Mvc or one of its or assembly System.Web.WebPages. Could not load file or assembly System.Web. I want to create one IIS web site per country and I want to be able to deploy each web site However I ve confirmed that IIS express is not installed, so I was wondering why this Q Could not load file or assembly System.Web.Optimization or one of its Helper를 ì¶”ê°€í•˜ê³ Copy Local Trueë¡œ ì„¤ì •í•˜ë‹ˆê¹Œ ë°°í¬ì—ì„œ 잘 ë™ìž‘하네요. System.Web.WebPages.Razor.dll v2.0.0.0. My question is what s the error why is . but not after deployed to IIS7.5 - Could not load file or assembly System. Could not load file or assembly System.Web.Helpers, Version 1.0.0.0 I recently ran in to this error on an IIS 6 server using MVC 3 Razor.