Nuget error "Object reference not set to an instance of an object" while installing Entityframework 7 from Package Manager Console in VS2015

Question

I am trying to build a sample application using EF7 and mvc 6 in visual studio 2015 pre release.

While installing both EF7 and MVC6 using package manager console getting this error.

 PM> Install-Package EntityFramework.Commands -Version 7.0.0-beta3 -Pre
 Attempting to gather dependencies information for package    
 'EntityFramework.Commands.7.0.0-beta3' with respect to project
 targeting '.NETFramework, Version=v4.5.3' Install-Package : Object
 reference not set to an instance of an object. At line:1 char:1
 + Install-Package EntityFramework.Commands -Version 7.0.0-beta3 -Pre
 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
     + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

Can any one help me how to resolve this issue, or I am doing right?

Make sure you update your Nuget extension. There are quite a few known issues with Nuget 3. — leppie
– leppie, Commented Apr 21, 2015 at 5:30
@fgalarraga I have answered my question below once you disable "api.nuget.org/v3" from the package source, it will solve this problem, let me know you need more help. — jkyadav
– jkyadav, Commented May 12, 2015 at 4:35
I had same issue and I have solved by restarting visual studio 2015 — yarbuzon
– yarbuzon, Commented Nov 26, 2015 at 5:03

Nelson Nyland · Accepted Answer · 2021-12-30 22:00:49Z

19

Tools > NuGet Package Manager > Package Manager Settings
Clear All NuGet Caches
Restart Visual Studio

answered Dec 30, 2021 at 22:00

Nelson Nyland

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1 Comment

Jonathan Van Dam Over a year ago

If you do this approach, consider making a backup of your projects packages folder.

jkyadav · Accepted Answer · 2015-05-06 07:22:51Z

9

I have solved this problem, by disabling the "https://api.nuget.org/v3/" from the package source, in order to do this, Choose Tools > Nuget Package Manager > Package Source

And other thing I did is added myget package source "https://www.myget.org/F/aspnetvnext/api/v2/"

Following the steps Choose Tools > Nuget Package Manager > Package Source > Click add on top of the window and add the myget package source.

answered May 6, 2015 at 7:22

jkyadav

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1 Comment

cYOUNES Over a year ago

Or just add the clear tag in your configuration :-) <packageSources> <clear /> <add key="nuget.org" value="api.nuget.org/v3/index.json" protocolVersion="3" /> </packageSources>

Trevor · Accepted Answer · 2015-11-16 01:45:06Z

9

I had a similar issue in Visual Studio 2015 Community Edition.

Created a simple ASP.NET MVC 5 default project that I hosted on Azure. I was working through the project and when I tried to load up the NuGet GUI but kept getting the "Object Reference..." error.

I restarted Visual Studio in Administrator mode (right-clicked Visual Studio and started in Administrator mode) which resolved the problem.

answered Nov 16, 2015 at 1:45

Trevor

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Comments

Sylvain Rodrigue · Accepted Answer · 2021-05-12 05:32:18Z

6

I solved my problem by adding:

https://api.nuget.org/v3/index.json

as a Package Sources feed, as shown on the picture below:

edited May 12, 2021 at 5:32

Sylvain Rodrigue

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answered May 15, 2016 at 18:13

MegaMilivoje

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2 Comments

Ivan Silkin Over a year ago

Turning the package sources on and off can also fix the issue. Some providers or network policies may block access to nuget.org.

ransems Over a year ago

My new install had a local directory, not the URL. So changing the Source here fixed it.

Amin Ghaderi · Accepted Answer · 2017-01-10 10:29:52Z

3

My problem solved by activation Microsoft and .NET source , and use it to get package.

answered Jan 10, 2017 at 10:29

Amin Ghaderi

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Comments

Elger Mensonides · Accepted Answer · 2015-10-02 14:24:11Z

2

What I had is that I was disconnected from the internet while trying to install any package.

Not sure if this covers everyting, but I have to say nuget and the package manager console is a great source for headaches.

edited Oct 2, 2015 at 14:24

answered Sep 11, 2015 at 11:33

Elger Mensonides

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1 Comment

Elger Mensonides Over a year ago

Care to explain the downvote? It will cause OP's error.

Max · Accepted Answer · 2020-10-20 13:48:01Z

1

For me, after consolidating nugets in the different projects in the solution (through the Consolidate tab), it started to work.

edited Oct 20, 2020 at 13:48

answered Oct 20, 2020 at 13:35

Max

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Jorge Wander Santana Ureña · Accepted Answer · 2016-07-27 20:11:45Z

0

In my case, i was having:

Object reference not set to an instance of an object

From package manager and i solved it closing all and opening again.

answered Jul 27, 2016 at 20:11

Jorge Wander Santana Ureña

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yao · Accepted Answer · 2019-09-30 20:36:10Z

0

After I restarted the computer, the problem is gone.

answered Sep 30, 2019 at 20:36

yao

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Ghost · Accepted Answer · 2018-04-22 14:00:03Z

-1

I think your IPaddress doesn't connect to nugetpackage Use proxy to change your IPaddress I think that's true.

answered Apr 22, 2018 at 14:00

Ghost

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Michael Freidgeim · Accepted Answer · 2024-06-07 06:07:27Z

-1

In .Net Core projects I was able to manually edit new version of required package in all projects to avoid the error, i.e.

 <PackageReference Include="Flurl.Http" Version="4.0.2" />

It maybe the same issue that was solved through the Consolidate tab in Max answer

answered Jun 7, 2024 at 6:07

Michael Freidgeim

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Ashraf Gardizy · Accepted Answer · 2019-02-13 19:36:10Z

-3

Perfect and ultimate Solution Guys this is the perfect solution for that. First install the latest version of nuget (Nuget.VisualStudio) from your visual studio. Then install the sqlite through the last version of nuget you installed already. for more details just look the picture bellow. Thanks

answered Feb 13, 2019 at 19:36

Ashraf Gardizy

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1 Comment

Mahyar Pasarzangene Over a year ago

This package is for working with nuget service in Visual studio and it is not related to the problem

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