Microsoft.EntityFrameworkCore.Migrations;

I've such a problem.I added migration but this error occurred:

Repository:

API:

using Hospital.Core.Entities; using Microsoft.EntityFrameworkCore;namespace Hospital.Repositories.Data {    public class ApplicationDbContext : DbContext    {        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)            : base(options)        {        }        //////    } }

program.cs:

builder.Services.AddDbContext<ApplicationDbContext>(options =>     options.UseNpgsql(builder.Configuration.GetConnectionString("HospitalConnection")));

I reinstalled the frameworks. Multiple actions with packages also with package manager