How can I solve installation error package?

Question

I create a Class Library on visual studio, I want to install Microsoft.EntityFrameworkCore but I have this error:

Could not install package 'Microsoft.EntityFrameworkCore 3.0.0'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.6.1', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

I already check my target framework and nuget version. I just wanted to create a DbContext in my project in order to communicate with my database.

public class ContextLM: DbContext
{
    public ContextLM() :base(nameOrConnectionString: "ContextLM") { }
    public virtual DbSet<Customer> Customer { get; set; }
}

Answer 1

You are inside a.Net Framework project, not a.Net Core project. You should download Entity Framework 6 from nuget instead of EF Core to solve the problem.

Or if you want change project type to a.Net Core project if you have to use EF Core