大佬能帮忙看下这个问题吗

NuGet\Install-Package : “NPOI”已拥有为“Portable.BouncyCastle”定义的依赖项。
所在位置 行:1 字符: 1
+ NuGet\Install-Package NPOI -Version 2.5.4
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Install-Package], InvalidOperationException
+ FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPackageCommand