mvc json serialisation

Question

Install-Package Newtonsoft.Json

'net20' not installed. Attempting to retrieve dependency from source...

Install-Package : Unable to resolve dependency 'net20'.

At line:1 char:16

+ Install-Package <<<< Newtonsoft.Json

+ CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException

+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand

 

in my project newtonjson already there .the dll is copied i think. when i have problem for displaying  more then 20 thousand records . somebody told me to install json.net . then i try to install this is the message . what to do

 

sithara