此项目引用此计算机上缺少的 NuGet 包

Question

I have an ASP.NET MVC5 application that worked yesterday and now I am getting this error when I try to build:

This project references NuGet package(s) that are missing on this computer.

I have the two options checked that allow nuget to automatically download and install missing packages checked / turned ON. I have also tried deleting all of the files in the packages folder and then have nuget re-download them. Also when I open nuget and look for updates it says there are none that need to be installed. I can't figure what else to do to move beyond this amazingly annoying issue.

I have also enabled nuget restore by right clicking the project and selecting that option. It then added a nuget folder and three items in that folder and does nothing to resolve the problem. I've tried re-building and still get the same error.

Answer 1

In my case, I had to remove the following from the .csproj file:

<Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
  <PropertyGroup>
    <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
  </PropertyGroup>
  <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
</Target>

In fact, in this snippet you can see where the error message is coming from.

I was converting from MSBuild-Integrated Package Restore to Automatic Package Restore ( http://docs.nuget.org/docs/workflows/migrating-to-automatic-package-restore )

Answer 2

One solution would be to remove from the .csproj file the following:

<Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
  <PropertyGroup>
    <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
  </PropertyGroup>
  <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
</Target>

How?

1. Right click on project. Unload Project.
2. Right click on project. Edit csproj.
3. Remove the part from the file. Save.
4. Right click on project. Reload Project.

Answer 3

In my case it happened after I moved my solution folder from one location to another, re-organized it a bit and in the process its relative folder structure changed.

So I had to edit all entries similar to the following one in my .csproj file from

  <Import Project="..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />

to

  <Import Project="packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />

(Note the change from ..\packages\ to packages\ . It might be a different relative structure in your case, but you get the idea.)

Answer 4

I easily solve this problem by right clicking on my solution and then clicking on the Enable NuGet Package Restore option

(PS: Ensure that you have the Nuget Install From Tools--> Extensions and Update--> Nuget Package Manager for Visual Studio 2013. If not install this extention first)

Hope it helps.

Answer 5

In my case it had to do with the Microsoft.Build.Bcl version. My nuget package version was 1.0.21, but my project files were still pointing to version 1.0.14

So I changed my .csproj files from:

  <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
   <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
    <Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
    <Error Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
  </Target>

to:

 <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets" Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" />
  <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
    <Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
    <Error Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />

And the build was working again.

Answer 6

I have the same issue. I encountered it when I copied an existing project and transferred it on the folder of my solution directory and added it as existing project to my empty solution. So I have to edit my csproj file and look for this specific line of code, most of the time, this is can be found on the last lines:

  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

After that line, I have to comment these out:

  <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
    <PropertyGroup>
      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
    </PropertyGroup>
    <Error Condition="!Exists('..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.props'))" />
    <Error Condition="!Exists('..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets'))" />
  </Target>
  <Import Project="..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets" Condition="Exists('..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets')" />

Your solution will prompt that there was a change on your project, just select Reload All:

Then everything works fine after rebuilding my solution.

Answer 7

If you are using TFS

Remove the NuGet.exe and NuGet.targets files from the solution's .nuget folder. Make sure the files themselves are also removed from the solution workspace. Retain the NuGet.Config file to continue to bypass adding packages to source control.

Edit each project file (eg, .csproj, .vbproj) in the solution and remove any references to the NuGet.targets file. Open the project file(s) in the editor of your choice and remove the following settings:

<RestorePackages>true</RestorePackages>  
...
<Import Project="$(SolutionDir)\.nuget\nuget.targets" />  
...
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">  
    <PropertyGroup>
        <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
    </PropertyGroup>
    <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
</Target>

---

If you are not using TFS

Remove the .nuget folder from your solution. Make sure the folder itself is also removed from the solution workspace.

Edit each project file (eg, .csproj, .vbproj) in the solution and remove any references to the NuGet.targets file. Open the project file(s) in the editor of your choice and remove the following settings:

<RestorePackages>true</RestorePackages>  
...
<Import Project="$(SolutionDir)\.nuget\nuget.targets" />  
...
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">  
    <PropertyGroup>
        <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
    </PropertyGroup>
    <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
</Target>

Reference: Migrating MSBuild-Integrated solutions to use Automatic Package Restore

Answer 8

Removed below lines in .csproj file

<Import Project="$(SolutionDir)\.nuget\NuGet.targets" 
Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
<PropertyGroup>
 <ErrorText>This project references NuGet package(s) that are missing on this computer. 
 Enable NuGet Package Restore to download them.  For more information, see 
 http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
</PropertyGroup>
<Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" 
Text="$([System.String]::Format('$(ErrorText)', 
'$(SolutionDir)\.nuget\NuGet.targets'))" />
</Target>

Answer 9

Is it possible that the packages have been restored to the wrong folder? Check that the paths in the csproj files are correct.

If they are different it could be caused by the packages now being restored to a different location. This could be caused by a NuGet.Config file being checked in specifying a node like this:

<add key="repositoryPath" value="..\..\Packages" />

The packages are being restored, by the projects are still looking at the old location.

Answer 10

I had the same issue. In my case installing the Microsoft.Bcl.Build package fixed the problem.

Answer 11

One solution would be to remove from the .csproj file the following:

<Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />

This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105 . The missing file is {0}.

Answer 12

The first thing to try is to right-click the solution and select "Restore Nuget Packages".

In my case that did not work, so I followed some recommendations on deleting "Import" and "Target" on project file, this worked for 2 of my 3 projects, but got a different error on the last one.

What worked was to open the Package Manager Console and run:

Update-Package -reinstall -ProjectName MyProjectName

It takes some time but since it reinstall all packages your project will compile without problems

Answer 13

These are the steps I used to fix the issue:

To add nuget packages to your solution:

1. Right click on the project (not solution) you want to reference nuget packages.
2. Choose: Manage nuget packages
3. On the popup window, on the left you have three choices. If you choose Online > Microsoft & .NET , you will be able to install Microsoft ASP.NET Web API 2.2 package grouper (or whatever package you need - mine was this).
4. Now right click on your solution (not project) and choose Enable nuget package restore . This will cause the packages to be automagically downloaded at compilation.

Answer 14

对我来说，它起作用了，因为我只是将 .nuget 文件夹从工作解决方案复制到现有解决方案，并引用了它的内容！

Answer 15

I had this when the csproj and sln files were in the same folder (stupid, I know). Once I moved to sln file to the folder above the csproj folder my so

Answer 16

I had this issue when I got a new computer from my company and tried to build the project after cloning it with Git. The problem was my NuGet settings did not include a remote repository from which to fetch packages. Following the FAQ at NuGet.org , I found this:

I don't see nuget.org in my list of repositories, how do I get it back?

• Add https://api.nuget.org/v3/index.json to your list of sources, or Delete %appdata%\.nuget\NuGet.Config (Windows) or ~/.nuget/NuGet/NuGet.Config (Mac/Linux) and let NuGet re-create it.

In my case, there wasn't a %appdata%\.nuget directory on my machine at all, so from within Visual Studio, I followed these steps to fix the issue:

1. Click on Tools > NuGet Package Manager > Package Manager Settings in the toolbar
2. Select NuGet Package Manager > Package Sources from the list on the left
3. Click the green + in the top-right to add a new source
4. Set the Name: value to NuGet.org
5. Set the Source: value to https://api.nuget.org/v3/index.json

After that, NuGet was able to download the packages it couldn't find.

To get rid of the errors in the build, I did these steps:

1. Delete the bin and obj directories in the solution
2. Click on Build > Rebuild Solution in the toolbar

Once the build was complete, the errors were gone.

Answer 17

The mistake appears to have been triggered somewhere in the code. Let's look at the.csproj file, where this can be found towards the end.

Step 1 Remove the package from package.config file.

<package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.1" targetFramework="net46" />

Step 2 Edit the .csproj project file and removed the below settings

<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
<PropertyGroup>
  <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
</PropertyGroup>
<Error Condition="!Exists('..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.1\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />

Step 3 Go to package manager console and run the command Update-Package –reinstall

Answer 18

I had the same issue when i reference the Class library into my MVC web application,

the issue was the nuget package version number mismatch between two projects.

ex: my class library had log4net of 1.2.3 but my webapp had 1.2.6

fix: just make sure both the project have the same version number referenced.

Answer 19

Editing .sln and .csproj is not always that easy or desirable. Once you get the error list you can see what projects have missing packages (also, the References node usually indicate that there are missing assemblies unless packages are source code, resources, images, or just text-based ones).

Removing and then adding the packages is not a good idea unless you use the latest version of the package. Otherwise be prepared for surprises, not always pleasant ones.

If, say, the package is EntityFramework then from NuGet gallery you get the latest version which at the time of writing this comment it is 6.1.3 .

So, maybe the safest way to handle the situation is to restore the missing packages one by one. Yes, a bit painful exercise but chasing subtle bugs due to different package version maybe much more unpleasant.

Having this said, and let again EntityFramework be the missing package, you can issue the following command in the Package-Manager Console:

PM> Install-Package EntityFramework -Version 6.0.1 

This will install the correct version, that is 6.0.1 , that is the one that is specified in packages.config:

    <?xml version="1.0" encoding="utf-8"?>
    <packages>
      <package id="EntityFramework" version="6.0.1" targetFramework="net451" />
    </packages>

Answer 20

I had the same error but in my case it was not related to nuget packages at all. My solution had project that had reference to other projects that were not a part of my solution and were not built. After building them with some other solution (or I could include them into my solution as well), AND re-opening my solution in visual studio the issue was resolved.

Answer 21

After some time to solve this problem. Simply add a Package source with the source https://api.nuget.org/v3/index.json solve the error on my side

Answer 22

I created a folder named '.nuget' in solution root folder Then added file 'NuGet.Config' in this folder with following content

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<solution>
 <add key="disableSourceControlIntegration" value="true" />
</solution>
</configuration>

Then created file '.nuGet.targets' as below $(MSBuildProjectDirectory)..\

    <!-- Enable the restore command to run before builds -->
    <RestorePackages Condition="  '$(RestorePackages)' == '' ">false</RestorePackages>

    <!-- Property that enables building a package from a project -->
    <BuildPackage Condition=" '$(BuildPackage)' == '' ">false</BuildPackage>

    <!-- Determines if package restore consent is required to restore packages -->
    <RequireRestoreConsent Condition=" '$(RequireRestoreConsent)' != 'false' ">true</RequireRestoreConsent>

    <!-- Download NuGet.exe if it does not already exist -->
    <DownloadNuGetExe Condition=" '$(DownloadNuGetExe)' == '' ">false</DownloadNuGetExe>
</PropertyGroup>

<ItemGroup Condition=" '$(PackageSources)' == '' ">
    <!-- Package sources used to restore packages. By default will used the registered sources under %APPDATA%\NuGet\NuGet.Config -->
    <!--
        <PackageSource Include="https://nuget.org/api/v2/" />
        <PackageSource Include="https://my-nuget-source/nuget/" />
    -->
</ItemGroup>

<PropertyGroup Condition=" '$(OS)' == 'Windows_NT'">
    <!-- Windows specific commands -->
    <NuGetToolsPath>$([System.IO.Path]::Combine($(SolutionDir), ".nuget"))</NuGetToolsPath>
    <PackagesConfig>$([System.IO.Path]::Combine($(ProjectDir), "packages.config"))</PackagesConfig>
    <PackagesDir>$([System.IO.Path]::Combine($(SolutionDir), "packages"))</PackagesDir>
</PropertyGroup>

<PropertyGroup Condition=" '$(OS)' != 'Windows_NT'">
    <!-- We need to launch nuget.exe with the mono command if we're not on windows -->
    <NuGetToolsPath>$(SolutionDir).nuget</NuGetToolsPath>
    <PackagesConfig>packages.config</PackagesConfig>
    <PackagesDir>$(SolutionDir)packages</PackagesDir>
</PropertyGroup>

<PropertyGroup>
    <!-- NuGet command -->
    <NuGetExePath Condition=" '$(NuGetExePath)' == '' ">$(NuGetToolsPath)\nuget.exe</NuGetExePath>
    <PackageSources Condition=" $(PackageSources) == '' ">@(PackageSource)</PackageSources>

    <NuGetCommand Condition=" '$(OS)' == 'Windows_NT'">"$(NuGetExePath)"</NuGetCommand>
    <NuGetCommand Condition=" '$(OS)' != 'Windows_NT' ">mono --runtime=v4.0.30319 $(NuGetExePath)</NuGetCommand>

    <PackageOutputDir Condition="$(PackageOutputDir) == ''">$(TargetDir.Trim('\\'))</PackageOutputDir>

    <RequireConsentSwitch Condition=" $(RequireRestoreConsent) == 'true' ">-RequireConsent</RequireConsentSwitch>
    <!-- Commands -->
    <RestoreCommand>$(NuGetCommand) install "$(PackagesConfig)" -source "$(PackageSources)"  $(RequireConsentSwitch) -o "$(PackagesDir)"</RestoreCommand>
    <BuildCommand>$(NuGetCommand) pack "$(ProjectPath)" -p Configuration=$(Configuration) -o "$(PackageOutputDir)" -symbols</BuildCommand>

    <!-- Make the build depend on restore packages -->
    <BuildDependsOn Condition="$(RestorePackages) == 'true'">
        RestorePackages;
        $(BuildDependsOn);
    </BuildDependsOn>

    <!-- Make the build depend on restore packages -->
    <BuildDependsOn Condition="$(BuildPackage) == 'true'">
        $(BuildDependsOn);
        BuildPackage;
    </BuildDependsOn>
</PropertyGroup>

<Target Name="CheckPrerequisites">
    <!-- Raise an error if we're unable to locate nuget.exe  -->
    <Error Condition="'$(DownloadNuGetExe)' != 'true' AND !Exists('$(NuGetExePath)')" Text="Unable to locate '$(NuGetExePath)'" />
    <SetEnvironmentVariable EnvKey="VisualStudioVersion" EnvValue="$(VisualStudioVersion)" Condition=" '$(VisualStudioVersion)' != '' AND '$(OS)' == 'Windows_NT' " />
    <DownloadNuGet OutputFilename="$(NuGetExePath)" Condition=" '$(DownloadNuGetExe)' == 'true' AND !Exists('$(NuGetExePath)')"  />
</Target>

<Target Name="RestorePackages" DependsOnTargets="CheckPrerequisites">
    <Exec Command="$(RestoreCommand)"
          Condition="'$(OS)' != 'Windows_NT' And Exists('$(PackagesConfig)')" />

    <Exec Command="$(RestoreCommand)"
          LogStandardErrorAsError="true"
          Condition="'$(OS)' == 'Windows_NT' And Exists('$(PackagesConfig)')" />
</Target>

<Target Name="BuildPackage" DependsOnTargets="CheckPrerequisites">
    <Exec Command="$(BuildCommand)" 
          Condition=" '$(OS)' != 'Windows_NT' " />

    <Exec Command="$(BuildCommand)"
          LogStandardErrorAsError="true"
          Condition=" '$(OS)' == 'Windows_NT' " />
</Target>

<UsingTask TaskName="DownloadNuGet" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
        <OutputFilename ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
        <Reference Include="System.Core" />
        <Using Namespace="System" />
        <Using Namespace="System.IO" />
        <Using Namespace="System.Net" />
        <Using Namespace="Microsoft.Build.Framework" />
        <Using Namespace="Microsoft.Build.Utilities" />
        <Code Type="Fragment" Language="cs">
            <![CDATA[
            try {
                OutputFilename = Path.GetFullPath(OutputFilename);

                Log.LogMessage("Downloading latest version of NuGet.exe...");
                WebClient webClient = new WebClient();
                webClient.DownloadFile("https://nuget.org/nuget.exe", OutputFilename);

                return true;
            }
            catch (Exception ex) {
                Log.LogErrorFromException(ex);
                return false;
            }
        ]]>
        </Code>
    </Task>
</UsingTask>

 <UsingTask TaskName="SetEnvironmentVariable" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
        <EnvKey ParameterType="System.String" Required="true" />
        <EnvValue ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
        <Using Namespace="System" />
        <Code Type="Fragment" Language="cs">
            <![CDATA[
            try {
                Environment.SetEnvironmentVariable(EnvKey, EnvValue, System.EnvironmentVariableTarget.Process);
            }
            catch  {
            }
        ]]>
        </Code>
    </Task>
</UsingTask>