Error:The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception.

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hello

i m getting this exception in below code..plz help me out ...to understand this exceptiion


//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated from a template.
//
// Manual changes to this file may cause unexpected behavior in your application.
// Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace DemoCustomActionPaneAndRibbon.Models
{
using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;

public partial class NORTHWNDEntities : DbContext
{
public NORTHWNDEntities():base("name=NORTHWNDEntities")//here i m getting above exception
{
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
throw new UnintentionalCodeFirstException();
}

public DbSet<Category> Categories { get; set; }
public DbSet<Customer> Customers { get; set; }
public DbSet<Order_Detail> Order_Details { get; set; }
public DbSet<Order> Orders { get; set; }
public DbSet<Product> Products { get; set; }
}
}