how can i solve : the type or namespace name 'DbModelBuilder' Could not be found
<p>i created an MVC Project for test on another PC last night
it worked good on that PC but when i want to build it on my own PC it i give error : 
the type or namespace name 'DbModelBuilder' Could not be found(are you missing...)
how can i solve it ?</p>

<pre><code>using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions.Edm.Db;

namespace University.Models
{
    public class SchoolContext : DbContext
    {
        public DbSet&lt;Student&gt; Students { get; set; }
        public DbSet&lt;Enrollment&gt; Enrollments { get; set; }
        public DbSet&lt;Course&gt; Courses { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Conventions.Remove&lt;PluralizingTableNameConvention&gt;();
        }
    }
}
</code></pre>
