'Newtonsoft.Json' already has a dependency defined for 'NETStandard.Library'

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安装NEST的时候报了如下的错误：

PM> Install-Package NEST

Attempting to resolve dependency 'Elasticsearch.Net (≥ 5.5.0 && < 6.0.0)'.

Attempting to resolve dependency 'Newtonsoft.Json (≥ 10.0.0 && < 11.0.0)'.

Install-Package : 'Newtonsoft.Json' already has a dependency defined for 'NETStandard.Library'.At line:1 char:1

+ Install-Package NEST

+ ~~~~~~~~~~~~~~~~~~~~

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

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

怎么回事那？

【解决方法】

升级Nuget

升级完成后，需要重新启动visual studio, 庵后再次安装就可以了。