Unable to Install Any Package in Visual Studio 2015

Question

I ve tried every package I could possibly find and none of them will install in my project   I ve installed every update listed in the Extensions and Updates list that were available   When I attempt to install SendGrid for example  this is the result  as is the result with all other packages      Attempting to gather dependencies information for package  Sendgrid 6 1 0  with respect to project  UI MyApplication MVC   targeting   NETFramework Version v4 5 2  Attempting to resolve dependencies for package  Sendgrid 6 1 0  with DependencyBehavior  Lowest  Resolving actions to install package  Sendgrid 6 1 0  Resolved actions to install package  Sendgrid 6 1 0  For adding package  SendGrid SmtpApi 1 3 1  to project  MyApplication MVC  that targets  net452   For adding package  SendGrid SmtpApi 1 3 1  to project  MyApplication MVC  that targets  net452   Adding package  SendGrid SmtpApi 1 3 1  to folder  C  Users Keith Source Workspaces MyApplication MyApplication MVC packages  Install failed  Rolling back      I can t be the only one on the planet having issue with Visual Studio 2015 and the new and  improved  NuGet Package Manager     UPDATE  Well  must be something odd in my solution because I created a new project from the VS2015 template  web  and the packages install just fine   When I find out the issue  I ll post the resolution in the event others run into the same problem     UPDATE 2  Ok  it s not our solution   We created a new solution from scratch again  this has wasted a lot of our development time might I add   added a couple of packages  Identity  EF  SendGrid  and after checking the solution in to VSO  another developer performs a fresh creation of the branch and build errors occur   When I go to the NuGet packages for an individual project  it acts as though none of the packages I have added are available   Anyone else experiencing this

User · Answer

Just to help out anyone who has landed on this page after updating VS2015 to update 2 and trying to manage packages on a website, receiving the "NuGet configuration file is invalid" error, this is a known and acknowledged issue:

https://connect.microsoft.com/VisualStudio/feedback/details/2698136/nuget-configuration-is-invalid-manage-nuget-packages-for-solution-disabled

I got mine working again by installing package manager 3.4.4 (beta) from http://dist.nuget.org/index.html

They do also state update 3 for Visual Studio will also contain a fix

User · Answer

I had this problem  which seemed to be caused by something broken in the solution level packages folder  I deleted the contents of the folder and let nuget install all the packages again   I could then install new packages again

User · Answer

You need to Clear All NuGet Caches   for this you need go to Options and click on it like this

User · Answer

Simply restarting Visual Studio works for me   try restarting Visual Studio

User · Answer

Change the  package source  in nuget to All  Details  None of the above helped in my case  My problem was that I restricted to only one private feed  Once I changed the  package source  to All  my problem was solved  I believe the crux of the matter is that my private pkg has a dependency on other pkgs from nuget org   I hope this can help someone

User · Answer

In my case updating Microsoft CodeDom Providers DotNetCompilerPlatform and Microsoft Net Compilers caused the problem   Deleting bin  obj  and packages folders and restarting Visual Studio 2015 solved the problem for me

User · Answer

I was able to resolve this issue by reinstalling Nuget Package Manager via Tools -  Extensions and Updates

User · Answer

tl dr - Delete this    AppData  Nuget Nuget config   Warning  If you had custom NuGet sources  this will remove them  and you ll have to re-add them     Longer version   You might have corrupted your NuGet config  Oh no     Nuget config is a file used to keep track of all of the places that NuGet pulls from  as well as configuring other things  More likely than not  this xml file got broken somehow    Go to this path  C  Users   username   AppData Roaming  Delete Nuget config Restart VS for good measure     For reference  in the good days of 2017  your file should look something like this   lt  xml version  1 0  encoding  utf-8   gt   lt configuration gt     lt packageRestore gt       lt add key  enabled  value  True    gt       lt add key  automatic  value  True    gt     lt  packageRestore gt     lt activePackageSource gt       lt add key  nuget org  value  https   api nuget org v3 index json    gt     lt  activePackageSource gt     lt packageSources gt       lt add key  nuget org  value  https   api nuget org v3 index json  protocolVersion  3    gt       lt add key  nuget org  value  https   www nuget org api v2     gt       lt  -- Others -- gt     lt  packageSources gt     lt packageSourceCredentials gt       lt  -- secret stuff -- gt     lt  packageSourceCredentials gt   lt  configuration gt

User · Answer

Closing and re-opening VS2015 resolves the issue    It seems that in some cases  simply reloading the affected project will work

User · Answer

I found a solution for this in my case  try to update the NuGet Package Manager   To do this    From VS  go to Tools -  Extensions and Updates Open the Updates menu option at the left  then select Visual Studio Gallery  If there is an update for Nuget Package Installer  it should show in the list to the right  Click Update Restart Visual Studio   This let me install packages without problem again   Hope this helps

User · Answer

In my case  there was an empty packages config file in the soultion directory  after deleting this  update succeeded

User · Answer

My guess is Nuget Package Manager is messing up with VSO  I create a new project  add packages to it just fine  check in TFS  Then I go home   Get Latest Version   and Run  and fail because Nuget Package Manager doesn t restore my packages  Solution  on my home machine   open Nuget Package Manger  uninstall every packaged that have installed Open References folder  right click   Delete for all the packages you ve installed Re-install them via Nuget Package Manager Check in

User · Answer

I am using Visual Studio 2015 Update 3 and I managed to reproduce this error  despite Update 3 allegedly containing a fix    As suggested above  a reliable fix is to do the following    1  Exit Visual Studio  2  Delete the packages folder  3  Restart VS   But    if you don t want to immediately exit VS for some reason  I was still able to add remove packages from all projects by choosing the  Manage NuGet Packages for Solution  option  rather than the individual Project with the issue

User · Answer

In my case  This problem was caused by a mismatch in my Target framework setting under each project   When I created a new project  VS 2015 defaulted to 4 5 2  however all my nuget packages were built for 4 6     For some reason  VS 2015 was not showing me these errors   I didn t see them until I created a new empty project and tried to add my nuget project there   This behavior may have been aggravated because I had renamed the project a few times during the initial setup   I solved the problem by    changing the Target Framework on my projects to 4 6 closed VS 2015 deleted  packages    obj  and  bin  folders re-open the solution and try to add the nuget package again

User · Answer

In general closing and re-open VS 2015 fixed most problems I have ran across   Once I did need to run a repair on one of my computers   However I was about to do this  Closing and re-opening VS2015 resolved the issue for me  I figured that I would instead right click on the project and Unload Project  then right click and Reload project  THEN Manage Nuget worked

User · Answer

Open the packages folder  Check if files with extension  deleteme exists  example Newtonsoft Json 9 0 1 deleteme  Delete all the packages which have a  deleteme file manually  Delete the  deleteme files  Close and open the Nuget Explorer

User · Answer

Repairing Visual Studio 2015 seems to have resolved this issue for me  See this issue for NuGet in GitHub

User · Answer

In my case  nothing of the above helped  The root cause of the problem in my case was  that I uninstalled the package before and did not check in the change into source control  TFS in my case   After checking in the change   the deletion of file in the packages folder   I could reinstall the package

User · Answer

I had this problem with Visual Studio 2017  It turns out that there are two class library projects - one for  Net and the other for C   I created the one for  Net and when I tried to install a specific package  Nunit in my case  I got the error message    Recreating the project as C  class library fixed the problem

[package] Unable to Install Any Package in Visual Studio 2015

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