Value cannot be null. Parameter name: entitySet

Question

I have a fairly standard setup with simply POCO classes

public class Project
{

    public int ProjectId { get; set; }
    public string Name { get; set; }
          


        

Answer 1

In my case I had to reference another model class called IanaTimeZone, but instead of

public virtual IanaTimeZone Timezone { get; set; }

out of rush I typed this:

public virtual TimeZone Timezone { get; set; }

and it compiled fine because VS thought it was System.TimeZone but EF6 was throwing the error. Stupid thing but took me a while to figure out, so maybe this will help someone.