Home: Unable to resolve "CoreClassLibrary" The folder 'D:\xxx\netstandard1.5' contains an invalid version.

[barbarosalp]

I created a .net core class library and a .net core web application from Visual Studio using default project templates. And I created a nuget package for this class library then I copied it to my local nuget folder.

When I try to add this nuget reference to my web application I am getting a reference error and the output is like this:

Package Manager Output

Installing NuGet package Solid.Common.Log.1.0.0.1.
Successfully installed 'Solid.Common.Log 1.0.0.1' to Solid.Disaster.Web
========== Finished ==========
PATH=.\node_modules\.bin;C:\Program Files (x86)\Microsoft Visual Studio 14.0\Web\External;%PATH%;C:\Program Files (x86)\Microsoft Visual Studio 14.0\Web\External\git
C:\Program Files\dotnet\dotnet.exe restore "D:\Projects\Playground\Solid.Disaster.Web\.vs\restore.dg"
log  : Restoring packages for D:\Projects\Playground\Solid.Disaster.Web\src\Solid.Disaster.Web\project.json...
info :   CACHE https://api.nuget.org/v3-flatcontainer/microsoft.netcore.dotnethostresolver/index.json
info :   CACHE https://api.nuget.org/v3-flatcontainer/microsoft.netcore.dotnethost/index.json
warn : The folder 'D:\Projects\MyNuget\Solid.Common.Log\netstandard1.5' contains an invalid version.
info :   GET https://api.nuget.org/v3-flatcontainer/solid.common.log/index.json
info :   NotFound https://api.nuget.org/v3-flatcontainer/solid.common.log/index.json 661ms
error: Unable to resolve 'Solid.Common.Log (>= 1.0.0.1)' for '.NETCoreApp,Version=v1.0'.
log  : Restoring packages for tool 'Microsoft.AspNetCore.Server.IISIntegration.Tools' in D:\Projects\Playground\Solid.Disaster.Web\src\Solid.Disaster.Web\project.json...
info : Committing restore...
log  : Writing lock file to disk. Path: D:\Projects\Playground\Solid.Disaster.Web\src\Solid.Disaster.Web\project.lock.json
log  : D:\Projects\Playground\Solid.Disaster.Web\src\Solid.Disaster.Web\Solid.Disaster.Web.xproj
log  : Restore failed in 1382ms.
Errors in D:\Projects\Playground\Solid.Disaster.Web\src\Solid.Disaster.Web\Solid.Disaster.Web.xproj
    Unable to resolve 'Solid.Common.Log (>= 1.0.0.1)' for '.NETCoreApp,Version=v1.0'.
NuGet Config files used:
    C:\Users\SolidWrist\AppData\Roaming\NuGet\NuGet.Config
    C:\ProgramData\nuget\Config\Microsoft.VisualStudio.Offline.config
Feeds used:
    https://api.nuget.org/v3/index.json
    D:\Projects\MyNuget
    C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\

Here is my environment info:

.NET Command Line Tools (1.0.0-preview1-002702)

Product Information:
Version: 1.0.0-preview1-002702
Commit Sha: 6cde21225e

Runtime Environment:
OS Name: Windows
OS Version: 6.3.9600
OS Platform: Windows
RID: win81-x64

Nuget Package Manager 3.4.4

This is the class library's project.json:

{
  "version": "1.0.0.1",

  "dependencies": {
    "NETStandard.Library": "1.5.0-rc2-24027"
  },

  "frameworks": {
    "netstandard1.5": {
      "imports": "dnxcore50"
    }
  },
  "scripts": {
    "postcompile": [
      "dotnet pack --no-build --configuration %compile:Configuration%"
    ]
  }
}

Web Application's project.json:

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "version": "1.0.0-rc2-3002702",
      "type": "platform"
    },
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-rc2-final",
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final",
    "Solid.Common.Log": "1.0.0.1"
  },

  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": {
      "version": "1.0.0-preview1-final",
      "imports": "portable-net45+win8+dnxcore50"
    }
  },

  "frameworks": {
    "netcoreapp1.0": {
      "imports": [
        "dotnet5.6",
        "dnxcore50",
        "portable-net45+win8"
      ]
    }
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
  },

  "runtimeOptions": {
    "gcServer": true
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

NuGet.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <activePackageSource>
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
  </activePackageSource>
  <packageSources>
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
    <add key="nuget.org" value="https://www.nuget.org/api/v2/" />
    <add key="LocalFeed" value="D:\Projects\MyNuget" />
  </packageSources>
  <disabledPackageSources>
    <add key="Microsoft and .NET" value="true" />
  </disabledPackageSources>
  <packageRestore>
    <add key="enabled" value="True" />
    <add key="automatic" value="True" />
  </packageRestore>
  <bindingRedirects>
    <add key="skip" value="False" />
  </bindingRedirects>
</configuration>

I've also asked the same question on stackoverflow.

What might be the reason of this error?

Thanks.

[barbarosalp]

@pranavkm

[pranavkm]

For the folder structure you have to work, the sha file has to sit next to the nupkg. Instead of manually creating the directory, use nuget.exe add <nupkg> -Source D:\Projects\MyNuget once you have deleted things under that directory. Try restoring after.

[barbarosalp]

@pranavkm Ok, I ve run it and it is working now.
Thank you so much!

[barbarosalp]

I realized that I've tried this yesterday at work but when I did that Solid.Common.Log was removed from Manage Packages for Solution Window, even if I refreshed the feed a couple of times.

This time, same thing happened but I didn't give up.
I opened up Nuget Package Manager > Source settings and clicked Update for my local feed then refreshed the feed... and again this package didn't appear there.

As a last step: I moved up my Local Feed source as the first item in the source list, then clicked Update again and it worked!