‘Newtonsoft.Json’ already has a dependency defined for ‘Microsoft.CSharp’

by

because NuGet Package Manager (Version 2.8.60318.667) for VS 2012 does not support .NETStandard (Used for Latest Newtonsoft Json Parser Lib.
https://github.com/NuGet/Home/issues/3131

I resolve this issue by installing older version of Newtonsoft Json:

PM> Install-Package Newtonsoft.Json -Version 9.0.1

More details on:
https://github.com/NuGet/Home/issues/5162
.

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