NuGet X already has a dependency defined for Y

Question

I m getting the following error in NuGet while trying to install package Microsoft AspNet Server IIS  Attempting to resolve dependency  Microsoft AspNet Loader IIS Interop    1 0 0-alpha4-10330    Attempting to resolve dependency  Microsoft AspNet Loader IIS    1 0 0-alpha4-10330     Microsoft AspNet Loader IIS  already has a dependency defined for  Microsoft AspNet FeatureModel     How to resolve it   UPDATE  Also  I m getting the following   Attempting to resolve dependency  Microsoft Framework DependencyInjection    1 0 0-alpha4-10326     Microsoft Framework DependencyInjection  already has a dependency defined for  Microsoft Framework ConfigurationModel

User · Answer

I faced this error on outdated version of Visual Studio 2010. Due to project configuration I was not able to update this version to newer. Therefore, update of NuGet advised above did not fix things for me.

Root reason for the error in this and similar situations is in dependencies of the package you try to install, which are not compatible with .NET version available in your project.

Universal solution is not obligatory update of Visual Studio or .NET but in installation of older NuGet versions of the same package compatible with your system.

It is not possible to tell for sure, which of earlier versions will work. In my case, this command installed the package without any NuGet updates.

Install-Package X -Version [compatible version number]

User · Answer

The only solution that worked for me was to uninstall nuget completely from Visual Studio 2013 and then install it again with the obligatory restart of VS in between

User · Answer

Go to Tools   Extensions and Updates  Update Nuget and any other important feature  Restart    Done

User · Answer

In a project using vs 2010  I was only able to solve the problem by installing an older version of the package that I needed via Package Manager Console   This command worked   PM gt  Install-Package EPPlus -Version 4 5 3 1   This command did not work   PM gt  Install-Package EPPlus -Version 4 5 3 2

User · Answer

In my case I had to delete the file NuGet exe in the Project folder  nuget and rebuild the project   I also have in NuGet targets the DownloadNuGetExe marked as true    lt DownloadNuGetExe Condition      DownloadNuGetExe           gt true lt  DownloadNuGetExe gt    Hope it s helps

User · Answer

I tried the update  but it did not work for me  Helped    Uninstall NuGet    Tools    Extensions and update    Installed  Install NuGet  Reload Visual Studio

User · Answer

I was getting this issue on our TeamCity build server  I tried updating NuGet on the build server  via TC  but that didn t work  I finally resolved the problem by changing the  Update Mode  of the Nuget Installer build step from solution file to packages config

User · Answer

This was resolved by installing the latest NuGet Package Manager    https   visualstudiogallery msdn microsoft com 4ec1526c-4a8c-4a84-b702-b21a8f5293ca  Don t forget to restart Visual Studio

User · Answer

Go to the link https   www nuget org packages ClosedXML 0 64 0 Search your NuGet packages  See the all version of related packages Install the lower version of packages

User · Answer

I was getting the issue  Newtonsoft Json  already has a dependency defined for  Microsoft CSharp  on the TeamCity build server   I changed the  Update Mode  of the Nuget Installer build step from solution file to packages config and NuGet exe to the latest version  I had 3 5 0  and it worked

User · Answer

I fixed a similar issue in my solution by    Opening up a command prompt Navigating to the  nuget folder in my solution Running nuget update -self   This upgraded the copy of NuGet exe that was in my solution from 2 8 0 to 3 4 4  which fixed the  X  already has a dependency defined for  Y  error that was stopping it from downloading SSH NET automatically before building    If your solution doesn t have a copy of NuGet exe in it - and it might not - then you should try the solution in TN s answer instead

[asp.net] NuGet: 'X' already has a dependency defined for 'Y'

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