installing nuget package "same key has already been added."
Solution 1
Your stack-trace tells the tale, it is NuGet.NetPortableProfileTable.BuildPortableProfileCollection() that fails. In a nutshell, it iterates the set of PCL reference assembly profiles and encounters the same profile more than once. This is a very strong hint that the content of your c:\program files (x86)\reference assemblies\microsoft\framework\.netportable directory is corrupted.
There are many possible ways to go about fixing the damage:
- If you have an active recollection of tinkering with this directory, like copying files, then undo what you did.
- Safest way to go about it is to uninstall all Visual Studio versions >= VS2010. Then clean up the directory by hand, deleting any stray files that are still present. Then reinstalling VS again.
- The not-so-safe but speedier way is to rename the c:\program files (x86)\reference assemblies directory and install the multi-targeting pack. I can't promise success.
- You can try to find the duplicate yourself and remove it. The directory structure looks like this:
Directory of C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.0\Profile
05/14/2014 01:01 PM <DIR> Profile1
05/14/2014 01:01 PM <DIR> Profile102
05/14/2014 01:01 PM <DIR> Profile104
05/14/2014 01:01 PM <DIR> Profile131
05/14/2014 01:01 PM <DIR> Profile136
05/14/2014 01:01 PM <DIR> Profile14
05/14/2014 01:01 PM <DIR> Profile143
05/14/2014 01:01 PM <DIR> Profile147
05/14/2014 01:01 PM <DIR> Profile154
05/14/2014 01:01 PM <DIR> Profile158
05/14/2014 01:01 PM <DIR> Profile18
05/14/2014 01:01 PM <DIR> Profile19
05/14/2014 01:01 PM <DIR> Profile2
05/14/2014 01:01 PM <DIR> Profile225
05/14/2014 01:01 PM <DIR> Profile23
05/14/2014 01:01 PM <DIR> Profile24
05/14/2014 01:01 PM <DIR> Profile240
05/14/2014 01:01 PM <DIR> Profile255
05/14/2014 01:01 PM <DIR> Profile3
05/14/2014 01:01 PM <DIR> Profile328
05/14/2014 01:01 PM <DIR> Profile336
05/14/2014 01:01 PM <DIR> Profile344
05/14/2014 01:01 PM <DIR> Profile36
05/14/2014 01:01 PM <DIR> Profile37
05/14/2014 01:01 PM <DIR> Profile4
05/14/2014 01:01 PM <DIR> Profile41
05/14/2014 01:01 PM <DIR> Profile42
05/14/2014 01:01 PM <DIR> Profile46
05/14/2014 01:01 PM <DIR> Profile47
05/14/2014 01:01 PM <DIR> Profile5
05/14/2014 01:01 PM <DIR> Profile6
05/14/2014 01:01 PM <DIR> Profile88
05/14/2014 01:01 PM <DIR> Profile92
05/14/2014 01:01 PM <DIR> Profile95
05/14/2014 01:01 PM <DIR> Profile96
Directory of C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.5\Profile
05/14/2014 12:59 PM <DIR> .
05/14/2014 12:59 PM <DIR> ..
05/14/2014 01:01 PM <DIR> Profile111
05/14/2014 01:01 PM <DIR> Profile259
05/14/2014 01:01 PM <DIR> Profile49
05/14/2014 01:01 PM <DIR> Profile7
05/14/2014 01:01 PM <DIR> Profile78
Directory of C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.6\Profile
05/14/2014 12:59 PM <DIR> .
05/14/2014 12:59 PM <DIR> ..
05/14/2014 01:01 PM <DIR> Profile151
05/14/2014 01:01 PM <DIR> Profile157
05/14/2014 01:01 PM <DIR> Profile31
05/14/2014 01:01 PM <DIR> Profile32
05/14/2014 01:01 PM <DIR> Profile44
05/14/2014 01:01 PM <DIR> Profile84
Solution 2
Check your packages.config Inside there, check for the packages you are trying to install. Maybe some reference are already there and this avoid that you can install the new ones.
If you find there the references, delete the reference from the packages.config and try to install again the package.
It happened to me sometimes that inside packages.config are some old reference that still left there even after removing the package from the Nuget Package Manager.
If not, you can delete the entire packages.config, then if you have the option to let Nuget download the packages, when you build your solution, the packages will be downloaded again.
I hope this helps
Solution 3
There is yet another path that produces this error. Here is how to reproduce it:
(1) Create a nuget package from a VS project (project 1).
(2) In project 2 that references project 1, install the project 1 nuget package.
(3) the installation will fail with the "same key" error.
The solution is to simply remove the reference to project 1 before installing the nuget package.
Solution 4
Looks like NuGet is finding a duplicate Portable Class Library (PCL) profile on your machine. It is shame the key is not logged in the exception callstack which would make things easy.
You could try Jon Skeet's PclPal program which can list the PCL profiles and see if there's anything duplicated.
I have another MonoPcl program that does a similar thing. It refers to Mono but works on Windows. It uses the NuGet source code so it will have the same problem as you are seeing in Visual Studio. However you should be able to modify the code to catch the exception or put some extra logging to see what the duplicate PCL profile is that is causing the problem.
Solution 5
Just update the Nuget package manager in tools -- extension and updates -- updates --visual studio gallery --update Nuget package manager
Jules
Updated on August 07, 2020Comments
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Jules almost 4 years
i am trying to install Microsoft.Bcl.Build 1.0.14
nuget returns
Installing 'Microsoft.Bcl.Build 1.0.14'. Successfully installed 'Microsoft.Bcl.Build 1.0.14'. Adding 'Microsoft.Bcl.Build 1.0.14' to LeadTracker.Calendar. Uninstalling 'Microsoft.Bcl.Build 1.0.14'. Successfully uninstalled 'Microsoft.Bcl.Build 1.0.14'. Install failed. Rolling back... An item with the same key has already been added.This also happens with json.net and other packages.
I can add nancy and topshelf but not json.net and bcl.
I have tried it in VS2012 and 2013. I have also tried uninstalling nuget and reinstalling. I have also tried adding the nuget to an empty class library and an empty console app. The same error is always returned.
This also happens with json.net and other packages.
I have also tried with no packages file
Any ideas most appreciated.
Here is the command and stacktrace
PM> Install-Package Microsoft.Bcl.Build Installing 'Microsoft.Bcl.Build 1.0.14'. You are downloading Microsoft.Bcl.Build from Microsoft, the license agreement to which is available at http://go.microsoft.com/fwlink/?LinkId=329770. Check the package for additional dependencies, which may come with their own license agreement(s). Your use of the package and dependencies constitutes your acceptance of their license agreements. If you do not accept the license agreement(s), then delete the relevant components from your device. Successfully installed 'Microsoft.Bcl.Build 1.0.14'. Adding 'Microsoft.Bcl.Build 1.0.14' to GoogleCalendarIntegration. Uninstalling 'Microsoft.Bcl.Build 1.0.14'. Successfully uninstalled 'Microsoft.Bcl.Build 1.0.14'. Install failed. Rolling back... Install-Package : An item with the same key has already been added. At line:1 char:1 + Install-Package Microsoft.Bcl.Build + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [Install-Package], ArgumentException + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PowerShell.Commands.InstallPac kageCommand PM> $error[0].exception.stacktrace at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at System.Collections.ObjectModel.KeyedCollection`2.AddKey(TKey key, TItem item) at System.Collections.ObjectModel.KeyedCollection`2.InsertItem(Int32 index, TItem item) at System.Collections.ObjectModel.Collection`1.Add(T item) at NuGet.CollectionExtensions.AddRange[T](ICollection`1 collection, IEnumerable`1 items) at NuGet.NetPortableProfileTable.BuildPortableProfileCollection() at NuGet.NetPortableProfileTable.get_Profiles() at NuGet.NetPortableProfileTable.GetProfile(String profileName) at NuGet.NetPortableProfile.Parse(String profileValue, Boolean treatOptionalFrameworksAsSuppor tedFrameworks) at NuGet.VersionUtility.IsPortableLibraryCompatible(FrameworkName projectFrameworkName, Framew orkName packageTargetFrameworkName) at NuGet.VersionUtility.IsCompatible(FrameworkName projectFrameworkName, FrameworkName package TargetFrameworkName) at NuGet.VersionUtility.<>c__DisplayClass8`1.<TryGetCompatibleItems>b__15(IGrouping`2 g) at System.Linq.Enumerable.WhereListIterator`1.MoveNext() at System.Linq.Buffer`1..ctor(IEnumerable`1 source) at System.Linq.OrderedEnumerable`1.<GetEnumerator>d__0.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at NuGet.VersionUtility.TryGetCompatibleItems[T](FrameworkName projectFramework, IEnumerable`1 items, IEnumerable`1& compatibleItems) at NuGet.ProjectSystemExtensions.GetCompatibleItemsCore[T](IProjectSystem projectSystem, IEnum erable`1 items) at NuGet.ProjectManager.ExtractPackageFilesToProject(IPackage package) at NuGet.ProjectManager.AddPackageReferenceToProject(IPackage package) at NuGet.ProjectManager.Execute(PackageOperation operation) at NuGet.ProjectManager.Execute(IPackage package, IPackageOperationResolver resolver) at NuGet.ProjectManager.AddPackageReference(IPackage package, Boolean ignoreDependencies, Bool ean allowPrereleaseVersions) at NuGet.VisualStudio.VsPackageManager.<>c__DisplayClass83.<AddPackageReference>b__85() at NuGet.VisualStudio.VsPackageManager.RunProjectAction(IProjectManager projectManager, Action action) at NuGet.VisualStudio.VsPackageManager.AddPackageReference(IProjectManager projectManager, IPa ckage package, Boolean ignoreDependencies, Boolean allowPrereleaseVersions) at NuGet.VisualStudio.VsPackageManager.<>c__DisplayClass3.<InstallPackage>b__7() at NuGet.VisualStudio.VsPackageManager.RunSolutionAction(Action action) at NuGet.VisualStudio.VsPackageManager.InstallPackage(IProjectManager projectManager, String p ackageId, SemanticVersion version, Boolean ignoreDependencies, Boolean allowPrereleaseVersions, B oolean skipAssemblyReferences, ILogger logger) at NuGet.VisualStudio.VsPackageManager.InstallPackage(IProjectManager projectManager, String p ackageId, SemanticVersion version, Boolean ignoreDependencies, Boolean allowPrereleaseVersions, I Logger logger) at NuGet.PowerShell.Commands.InstallPackageCommand.InstallPackage(IVsPackageManager packageMan ager) at NuGet.PowerShell.Commands.InstallPackageCommand.ProcessRecordCore() at NuGet.PowerShell.Commands.NuGetBaseCommand.ProcessRecord() PM>