Could not load file or assembly 'Microsoft.Owin, Version=2.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference.

Question

User-1028990472 posted

Going bonkers here since NuGet won't install Microsoft.Owin properly. How do I manually reference Microsoft.Owin this in the web.config? 
Other posts merely suggest using NuGet package manager (which won't work as Microsoft.Owin is already installed), or changing the app.config file (there is no app.config file in ASP.Net), so I'm stumped.
I've got an ASP.NET web forms app (sorry, not MVC, but the site has 2 million lines of code and we're not changing it to MVC any time soon) running DotNet 4.5

Answer 1

User-821857111 posted

Have you tried using the update-package command in Nuget?

Answer 2

User1644755831 posted

Hi mc9000,

1. ASP.NET Web Forms have web.config not app.config

2. As @Mike suggested try updating the package

Updates specified package for specified project

Update-Package Microsoft.Owin –Project ProjectName

http://www.nuget.org/packages/Microsoft.Owin/

3. if it doesn't work just remove and install the package again

Uninstall-Package Microsoft.Owin 
Install-Package Microsoft.Owin 

http://docs.nuget.org/Consume/Package-Manager-Console

Hope this works for you.

With Regards,

Krunal Parekh