Asp.net-mvc – Conflicting versions of ASP.NET Web Pages detected: specified version is “1.0.0.0”, but the version in bin is “2.0.0.0”

asp.netasp.net-mvcasp.net-webpagesweb.config

This error appears after updating ASP.NET Web Helpers Library today to version 2.0 which was apparently released today. I updated by mistake, however would like to resolve this now, if possible.

Conflicting versions of ASP.NET Web Pages detected: specified version is "1.0.0.0", but the version in bin is "2.0.0.0". To continue, remove files from the application's bin directory or remove the version specification in web.config.

Apparently this is the problem in web.config:

<add key="webpages:Version" value="1.0.0.0" />

Does anyone even have any information about this ASP.NET Web Helpers Library package 2.0? I was unable to find release notes. Nothing on Nuget site.

Best Answer

From Conflicting versions of ASP.NET Web Pages detected: You need to set webpages:Version appSettings with appropriate value. In your case it has to be 2.0.0.0

<appSettings>
    <add key="webpages:Version" value="2.0.0.0"/>
</appSettings>

Related Solutions

Asp.net-mvc – Could not load file or assembly ‘System.Web.Mvc’

I just wrote a blog post addressing this. You could install ASP.NET MVC on your server OR you can follow the steps here.

EDIT: (by jcolebrand) I went through this link, then had the same issue as Victor below, so I suggest you also add these:

* Microsoft.Web.Infrastructure
* System.Web.Razor
* System.Web.WebPages.Deployment
* System.Web.WebPages.Razor

Could not load file or assembly ‘System.Net.Http, Version=2.0.0.0 in MVC4 Web API

I had the same error while deploying previously converted (from .NET 4.5 to 4.0) web app on IIS 6.0.

In the web.config runtime section I've found

<dependentAssembly>
    <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
    <bindingRedirect oldVersion="0.0.0.0-4.0.0.0" newVersion="4.0.0.0"/>
</dependentAssembly>

which I've changed to

<dependentAssembly>
    <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
    <bindingRedirect oldVersion="0.0.0.0-1.0.0.0" newVersion="2.0.0.0"/>
</dependentAssembly>

Now works like charm.

Best Answer

Related Solutions

Asp.net-mvc – Could not load file or assembly ‘System.Web.Mvc’

Could not load file or assembly ‘System.Net.Http, Version=2.0.0.0 in MVC4 Web API

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