Failed to add reference to 'Newtonsoft.Json' - windows

I just installed Windows 8 on my PC and downloaded Microsoft Visual Studio Express 2012 for Windows 8. Updated and everything, and when I try to install anything thru Package Manager Console, I get following error:
PM> Install-Package Parse
Attempting to resolve dependency 'Newtonsoft.Json (≥ 4.5.9)'.
Successfully installed 'Newtonsoft.Json 4.5.11'.
Successfully installed 'parse 1.0.5'.
Successfully uninstalled 'Newtonsoft.Json 4.5.11'.
Install failed. Rolling back...
Install-Package : Failed to add reference to 'Newtonsoft.Json'.
At line:1 char:1
+ Install-Package Parse
+ ~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
Does anyone know how to fix this error?
Thanks, Jack

Check if you already have Newtonsoft.Json reference added in packages.config. If yes, delete Newtonsoft.Json entry and retry Install-Package.

Sometimes just removing it from packages.config might not be enough. I had to remove the Newtonsoft.Json directory from the packages-directory, after that installing worked.

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Nuget Install A Package

I am trying to install "Microsoft.ProjectOxford.SpeechRecognition-x64" using Nuget on Visual studio. I got the following error. What does it mean? Thanks
PM> Install-Package Microsoft.ProjectOxford.SpeechRecognition-x64
Install-Package : Solution is not saved. Please save your solution before managing NuGet packages. At line:1 char:1
+ Install-Package Microsoft.ProjectOxford.SpeechRecognition-x64
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetUnsavedSolution,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
The NuGet team deprecated solution level packages in NuGet 3.0. So install the NuGet package to solution without any project is not supported. You need create a project, then add the package to the project.

C# - Xamarin : installing android.support.design package

i'm trying to install "Install-Package Xamarin.Android.Support.Design" into Xamarin Visual Studio 2015, but after it starts downloading, this error occurs
Install-Package : Unable to find package 'Xamarin.Android.Support.Design'
At line:1 char:1
+ Install-Package Xamarin.Android.Support.Design
+ CategoryInfo : NotSpecified: (:) [Install-Package], Exception
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand
i don't understand any of that, what is wrong?
Ensure that you have a proper NuGet source defined. You can go to Tools -> Options -> NuGet Package Manager -> Package Sources to make sure. i.e.: https://api.nuget.org/v3/index.json
Secondly you should double check that your NuGet version is the latest. Go to Tools -> Extensions and Updates and update if you aren't on the latest version.
Finally you could also try to manually download the package from https://www.nuget.org/packages/Xamarin.Android.Support.Design/ and setup a local NuGet repository to ensure that works. Chances are one of the first bullets should fix this.
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After running Install-Package Elmah.MVC, I get the following error in Visual Studio:
Install-Package : Unable to find package 'Elmah.MVC'.
At line:1 char:1
+ Install-Package Elmah.MVC
+ ~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
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https://www.nuget.org/api/v2/
https://api.nuget.org/v3/index.json
You can try the following solutions to cope with your issue:
Solution # 1
Delete all the folders inside of the packages folder.
Update all packages in Nuget Package Manager.
Solution # 2
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Solution #3
Use the following link : https://docs.nuget.org/Release-Notes/Known-Issues
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Solution #4
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PM> Install-Package Sinch.SMS
Installing 'Sinch.SMS 1.1.0.0'.
Successfully installed 'Sinch.SMS 1.1.0.0'.
Adding 'Sinch.SMS 1.1.0.0' to DMMService.
Uninstalling 'Sinch.SMS 1.1.0.0'.
Successfully uninstalled 'Sinch.SMS 1.1.0.0'.
Install failed. Rolling back...
Install-Package : Could not install package 'Sinch.SMS 1.1.0.0'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.0', but the package doe
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At line:1 char:16
+ Install-Package <<<< Sinch.SMS
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+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand
PM>
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At line:1 char:16
+ Install-Package <<<< Microsoft.AspNet.WebPages.WebData
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Anyone know how I can fix this?

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