dbContext Error

I am currently learning bits and pieces with ASP.NET Core. But I am struggling to get to the bottom of an error I am receiving and feel I may have missed something, but do not know what. 

This error appears when I try to load the Index view. 

At the top of the controller class I have:

private readonly ApplicationDbContext _context;

And my Index Action is: 

public IActionResult Index()        {            var model = _context.Characters.ToList();            return View(model);        }

And the context is found in my model folder called ApplicationDbContext.cs, which looks like this: 

using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;using Microsoft.EntityFrameworkCore;namespace ForgingAhead.Models
{    public class ApplicationDbContext : DbContext    {        public DbSet<Character> Characters { get; set; }    }
}

Which is referencing the model here: 

using System;using System.Collections.Generic;using System.Linq;using System.Threading.Tasks;using System.ComponentModel.DataAnnotations;namespace ForgingAhead.Models
{    public class Character    {        public string Name { get; set; }        [Display(Name = "Is Active")]        public bool IsActive { get; set; }        public int Level { get; set; }        public int Strength { get; set; }        public int Dexterity { get; set; }        public int Intelligence { get; set; }        public List<Equipment> Equipment { get; set; }    }
}

And finally in my Startup.cs, my configuration:

public void ConfigureServices(IServiceCollection services)
{    services.AddEntityFrameworkSqlite()        .AddDbContext<ApplicationDbContext>();            services.AddMvc();
}

As far as I can see, I am doing what the error is telling me to do and that's configuring a service and calling AddDbContext. I have been following a tutorial to do this and last time I touch ASP.NET was 3 or 4 years ago, hence I am trying to get back into the flow of learning it properly. But for some reason, it doesn't seem obvious to me why this is not working.