NuGet Error NU1110

NU1110: The package `B` is available in the Global packages folder, but the source it came from `https://api.nuget.org/v3/index.json` is not one of the configured sources.

Issue

A previous restore retrieved package B from a package source which your current solution does not have configured.

While performing a package installation of package A, a dependent package B was needed transitively to complete the action. Restore found B in your Global packages folder), and the accompanying nupkg.metadata indicates a Source value which it cannot find in your solution.

When package source mapping is enabled, NuGet attempts to map transitive dependencies automatically by analyzing the source in the Global packages folder.

Solution

Option 1.

Create a package source mapping for package B.

Option 2.

Clear package B from your Global packages folder so that restore can download from one of your configured packages sources. For more information, see Managing the global packages, cache, and temp folders.

If your other solutions have different package sources and package source mapping configurations, this option may not be feasible.

Option 3.

Consider enabling a package source which you know has package B available.