how to resolve “Unable to find package” nuget error

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The package source was offline !!

I installed VS2017 professional on my system and opened an existing project and found that multiple packages were missing. I tried everything I could, without looking at Package Source !!

Manage Nuget Packages for Solution

I am writing this answer as I tried the below solutions but none of them worked :

  1. Clearing the cache
  2. Restoring or re-installing the packages
  3. Changing the targetFramework
  4. Updating the Nuget Package manager

Solution:

Step 01. Go to Package Manager Settings (Tools > Nuget Package Manager > Package Manager Settings)
Nuget Package Manager > Package Manager Settings

Step 02. Check the Package Source(s). As you can see, the package source is here already downloaded SDK/nugets/packages. I don’t know the reason but the online package source from nuget.org was missing from my system installation of Visual Studio.

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Step 03. Install the nuget.org as package source and then ‘Clear All Nuget Cache(s)’ and then restore the packages. The error will go away.

Name: nuget.org ( or as you wish)
Source: https://api.nuget.org/v3/index.json

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