NU1101 Errors in Blazor Projects

These NU1101 errors in your Blazor project suggest that the required NuGet packages aren't being found in the configured sources. To resolve this, Update NuGet Package Sources in Visual Studio:

• Go to Tools > Options > NuGet Package Manager > Package Sources
• Add or enable the official NuGet source:
• Name:   nuget.org
• Source: https://api.nuget.org/v3/index.json