Could not load file or assembly 'Newtonsoft.Json' or one of its dependencies

Question

First, It is not just duplicate. None of answers from following questions are working for me.

http://goo.gl/tS40cn
http://goo.gl/pH6v2T

I've just updated all my packages using Nuget Package Manager and I started receiving this error.

Could not load file or assembly 'Newtonsoft.Json, Version=6.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

My Package Config has:

<package id="Newtonsoft.Json" version="7.0.1" targetFramework="net45" />

Web.config includes this piece of code:

  <dependentAssembly>
    <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.5.0.0" newVersion="4.5.0.0" />
  </dependentAssembly>

Properties from Reference for Newtonsoft.Json

According to the answers from the similar questions, I have tried followings:

• Reinstalling package using Update-Package –reinstall Newtonsoft.Json
• Removing dependentAssembly config from Web.config for Newtonsoft.Json
• Changing newVersion to 6.0.0.0 and 7.0.0.0 in dependentAssembly. Doing so gave birth to new error.
• Also tried Get-Project -All | Add-BindingRedirect. It changes newVersion for Newtonsoft.Json to 4.5.0.0. But issue remains unresolved.

Please help me fixing this.

Answer 1

I know this is old, but I just ran into the same problem. My issue was that multiple projects in the solution used Newtonsoft.Json, but some were at different versions. I updated all of them to the most recent (9.0.1 as I type) and the problem went away.

Anyway... if anyone is still dealing with this, make sure to update the package in EVERY project in the solution.

HTH

Answer 2

Add Newtonsoft reference in my MVC project solves the problem for me.

Answer 3

After trying much of the above (and some other posts), I uninstalled with the package manager all of the following from the project affected:

Microsoft.AspNet.WebApi
Microsoft.AspNet.Client
Microsoft.AspNet.Core
Microsoft.AspNet.WebHost
Newtonsoft.Json

Then reinstalled Microsoft.AspNet.WebApi, which auto installed .Client, .Core, .WebHost, .Json.