Cfrgtkky

In package manager console execute: Update-Package –reinstall Newtonsoft.Json.

UPDATE

I originally posted this as a comment but as @OwenBlacker suggested I'll just put it here:

If you still get an error after doing this, then what worked for me eventually is that I deleted Json.Net's <dependentAssembly> section from my .config file. Reinstall brings it back if it's not there and apparently you need to delete it. Until there will be a normal solution in the package itself, I'm afraid this manual step is a must.

Note: Please read the comments below before doing this.

As per René's comment below BE AWARE that the command posted in the answer will reinstall the package in every project in your solution. So if you use the Newtonsoft.Json package in several projects and maybe use different versions, just executing the above command might have unwanted consequences.

To everyone having problems with Newtonsoft.Json v4.5 version try using this in web.config or app.config:

<runtime>

    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

       <dependentAssembly>

           <assemblyIdentity name="Newtonsoft.Json"

               publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>

           <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0"/>

       </dependentAssembly>

    </assemblyBinding>

</runtime>

IMPORTANT: Check that the configuration tag of your config file has no namespace attribute (as suggested in https://stackoverflow.com/a/12011221/150370). Otherwise, assemblyBinding tags will be ignored.

The key point is referencing right version in your config file.

Steps;

1- look at what is the version of your Newtonsoft.Json.dll in the project reference property what ever the version in your package folder (For example mine is 7.0.1 and the reference Version is 7.0.0.0)

2- look at what the project expect from you in the exception (mine is 6.0.0.0)

3- Add dependent assembly to your config file as it should be..

  <dependentAssembly>

    <assemblyIdentity name="Newtonsoft.Json"  publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>

    <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="7.0.0.0"/>

  </dependentAssembly>

I had no luck with any of the solutions presented here (uninstalling, reinstalling, deleting references, creating bindingRedirects etc.) I had to go back to an old version of Newtonsoft. Version 5.0.6 had been working before, so I tried that one. I had to enter these two commands in the Package Console:

uninstall-package newtonsoft.json -force

install-package newtonsoft.json -version "5.0.6"

The -force option in the first command is required to force the uninstall. Dependencies with other assemblies prevent the uninstall without it.

I fixed the problem adding this binding redirect to my .config file:

<runtime>

    . . . 

    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

        <dependentAssembly>

            <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed"

                culture="neutral" />

            <bindingRedirect oldVersion="4.5.0.0" newVersion="6.0.0.0" />

        </dependentAssembly>

    </assemblyBinding>

</runtime>

The error message complains about not finding version 4.5.0.0, the current version of Newtonsoft.Json is 6.0.0.0 so the redirect should go from 4.5 to 6.0, not viceversa

I think you are pointing to the wrong target, change it to 4.5 instead of 6.0

<dependentAssembly>

    <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed"

        culture="neutral" />

    <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="4.5.0.0" />

</dependentAssembly>

This should work.

I've spend couple of days trying to resolve this frustrating issue. I've tried pretty much everything that can be found on the web. Finally I found that this error could be caused (like in my case) by the different target .Net project versions (4.5 and 4.5.1) in one solution. The steps bellow fixed it for me:

1. Double check the .Net version of every project that's in your solution. Just right click on project and go to Properties.

2. If possible set the same .Net version for all projects. If not at least try to change the Startup project one (for me this was the one causing the issues).



3. 
   

   Remove all Newtonsoft.Json packs from the solution.

   
   
   

   uninstall-package newtonsoft.json -force

   
   


4. 
   

   Update all Newtonsoft.Json versions in all packages.config files, like so

   
   
   

   <package id="Newtonsoft.Json" version="7.0.1" targetFramework="net451" />

   
   


5. 
   

   Reinstall Newtonsoft.Json from "Package Manager Console" with:

   
   
   

   install-package newtonsoft.json

   
   



6. Rebuild the solution

(Optional) 7. If you changed the Startup project, return it again

uninstall-package newtonsoft.json -force

install-package newtonsoft.json

Did the trick for me :)

Remove the Newtonsoft.Json assembly from the project reference and add it again. You probably deleted or replaced the dll by accident.

I was writing a WebApi REST service client, so for me this error was caused by adding References to the System.Net.Http and System.Net.Http.Formatting assemblies manually via Add Reference, when I should have added the Microsoft.AspNet.WebApi.Client package via NuGet.
See also this answer to another question.

if you using multiple project in same solution
and library of the one other
check is all projects has same version of Newtonsoft.Json

You have 2 different versions of JSON.NET library in your solution. To solve this you should upgrade them to latest version. Follow these steps:

1-Open solution explorer
2-Right Click on solution name
3-Select Manage Nuget Packages for Solution
4-Select Updates from menu
5-Update JSON.NET package

This will resolve your issue.

link:
Could not load file or assembly 'Newtonsoft.Json, Version=7.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' or one of its dependencies

Normally adding the binding redirect should solve this problem, but it was not working for me. After a few hours of banging my head against the wall, I realized that there was an xmlns attribute causing problems in my web.config. After removing the xmlns attribute from the configuration node in Web.config, the binding redirects worked as expected.

http://www.davepaquette.com/archive/2014/10/02/could-not-load-file-or-assembly-newtonsoft-json-version4-5-0-0.aspx

Deploy the correct version to the CI machine

This is telling you that the assembly loader found a different version of the Newtonsoft.Json assembly, that does not match the reference you created in your project. To load the assembly correctly, you must either deploy the assembly side by side with your compiled code, or install the correct version of the assembly in the destination machine (i.e. in the GAC).

Alternative: make sure the configuration is in the correct file

If you want to keep the current solution, and load an assembly with a different version, make sure that the configuration you posted is in the correct .config file. Remember that there is no xpto.dll.config, a DLL loaded by an application always uses the config file of the running application.

<runtime>

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

  <dependentAssembly>

    <assemblyIdentity name="Newtonsoft.Json"

        publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>

    <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="7.0.0.0"/>

  </dependentAssembly>

</assemblyBinding>

Works for me.... just put the version you are using in newVersion i.e(newVersion="7.0.0.0")

Close solution.

Open packages.config and *.csproj with text editor and delete any line have Newtonsoft.Json

Ex:
<Reference Include="Newtonsoft.Json,Version=9.0.0.0,Culture=neutral,PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<HintPath>..packagesNewtonsoft.Json.9.0.1libnet40Newtonsoft.Json.dll</HintPath>
<Private>True</Private>
</Reference>

Or
<package id="Newtonsoft.Json" version="9.0.1" targetFramework="net40" />

Open solution again and re-install Newtonsoft.Json by Install-Package Newtonsoft.Json

It work for me.

We had the exact same issue that you mentioned. We're using nunit to run tests through CI, and we have nunit running a file called tests.nunit, which describe a list of test dll fixtures to run.

Each test fixture had their own config file, but when run through the "tests.nunit" file the binding redirects seem to be ignored. The solution was to add the binding redirects to a new config file, "tests.config" that was beside the "tests.nunit" file.

You should update the web.config file in the server.
When nuget install NewtonSoft update this file including this code

<runtime>

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

  <dependentAssembly>

    <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />

    <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />

  </dependentAssembly>

</assemblyBinding>

I have got the same type of problem. And I also solved it just doing the following:
Go to TOOLS > NuGet Package Manager and Select Package Manager Console. Finally, execute the following two commands :)

1. uninstall-package newtonsoft.json -force


2. install-package newtonsoft.json

In my case, the main project was still referencing an old version of Newtonsoft.Json which didn't exists in the project any more (shown by a yellow exclamation mark). Removing the reference solved the problem, no bindingRedirect was necessary.

I had the exact same problem with version 7.0.0.0, and the lib causing my problem was Microsoft.Rest.ClientRuntime which somehow was referring to the wrong version (6.0.0.0) of Newtonsoft.json, despite the right dependency management in nugget (the right version of newtonsoft.json (7.0.0.0) was installed).

I solved this by applying the redirection above from 6.0.0.0 to 7.0.0.0 (from Kadir Can) in the config file:

<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="7.0.0.0" />

----> After a few days without changing anything it came up again with the same error. I installed version 6.0.0.0 n updated it to 7.0.0.0 it works fine now.

Just check the version of Newtonsoft.Json Newtonsoft properties

Then you need to add that version in your web config (in my case 8.0.0.0)
Web config

In my case, after downloading the assembly and adding the reference to the project, I solved this by 'unblocking' the DLL before adding the reference to the project.

Using Windows explorer, browse to the DLL location, right-click on the DLL and then select 'properties'. You'll find an 'unblock' button on one of the tabs and then you can add the reference and the assembly will load correctly.

I made the mistake of adding a NewtonSoft .dll file for .Net 4.5.

My main project was 4.5, but when I added an extra project to my solution, it strangely added it as a .Net 2.0 project... and when I attempted to use NewtonSoft's 4.5 dll with this, I got this "Newtonsoft.Json couldn't be found" error.

The solution (of course) was to change this new project from .Net 2.0 to 4.5.

Nothing from above helped me, but what actually fixed it is the following:

1. 
   Remove all dependency bindings in app.config (from all app.config files in the solution)


2. Execute the following command from "Package Manager Console"
   

Get-Project -All | Add-BindingRedirect

3. Rebuild

Reference:
http://blog.myget.org/post/2014/11/27/Could-not-load-file-or-assembly-NuGet-Assembly-Redirects.aspx

Right click your project select manage Nuget packages, type newtonsoft in the search box and install the latest version. Then Run your App

I was facing the same error and struggled with it for hours. I had a web API project which is using Newtonsoft.json and another UnitTest project for the web API project. The unit test project also needed the Newtonsoft.json reference. But on adding the link I was getting the above exception.

I finally resolved it by adding the below code snippet in the app.config of the unit test project:

<dependentAssembly>

    <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30AD4FE6B2A6AEED" culture="neutral" />

    <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />

</dependentAssembly>

Another insidious problem is that it appears that binding redirects can just silently fail if the element has an incorrect configuration on any other dependentAssembly elements.

Ensure that you only have one element under each element.

In some instances, VS generates this:

  <dependentAssembly>

    <assemblyIdentity ...

    <assemblyIdentity ...

  </dependentAssembly>

Instead of

  <dependentAssembly>

    <assemblyIdentity ...

  </dependentAssembly>

  <dependentAssembly>

    <assemblyIdentity ...

  </dependentAssembly>

Took me a long time to realise this was the problem!

Below section add in to your web.config

<runtime>

    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

       <dependentAssembly>

           <assemblyIdentity name="Newtonsoft.Json"

               publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>

           <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0"/>

       </dependentAssembly>

    </assemblyBinding>

</runtime>

If error disappears locally and still appears on server, the solution that works with me is to delete bin folder and packages.config and web.config and reupload these files