asp.net mvc 4 - MVC4 - Controller Scaffolding, Custom Data context class issue: Unable to retrieve metadata -

when try create controller scaffolding, following error:

unable retrieve metadata 'turkup.models.admin.createcourseviewmodel'. schema specified not valid. errors: mapping of clr type edm ambiguous because multiple clr types match edm type 'coursework'.

here code model:

using system.componentmodel.dataannotations; using system.web.mvc;  namespace torkup.models.admin {     public class createcourseviewmodel     {         [hiddeninput(displayvalue = false)]         public int id { get; set; }          [required]         public string title { get; set; }     } } 

the custom data context class:

using system.data.entity; using system.linq; using torkup.classlibrary; using torkup.classlibrary.admin; using torkup.classlibrary.user;  namespace torkup.infrastructure {     public class universitydb : dbcontext, iuniversitydatasource     {         public universitydb() : base("defaultconnection") { }          // admin data         public dbset<course> courses { get; set; }         public dbset<class> classes { get; set; }         public dbset<coursework> courseworks { get; set; }         public dbset<student> students { get; set; }          // user data         public dbset<assignment> assignments { get; set; }         public dbset<task> tasks { get; set; }           // admin data         iqueryable<course> iuniversitydatasource.courses { { return courses; } }          iqueryable<class> iuniversitydatasource.classes { { return classes; } }          iqueryable<coursework> iuniversitydatasource.courseworks { { return courseworks; } }          iqueryable<student> iuniversitydatasource.students { { return students; } }          // user data         iqueryable<assignment> iuniversitydatasource.assignments { { return assignments; } }         iqueryable<task> iuniversitydatasource.tasks { { return tasks; } }          // save database         void iuniversitydatasource.save() { savechanges(); }     } } 

and class course:

using system.collections.generic;  namespace torkup.classlibrary.admin {     public class course     {         public int id { get; set; }         public string title { get; set; }         public string description { get; set; }         public icollection<class> classes { get; set; }         public icollection<coursework> courseworks { get; set; }     } } 

if have error, because in dbcontext:

   // admin data     public dbset<course> courses { get; set; }     public dbset<class> classes { get; set; }     public dbset<coursework> courseworks { get; set; } //you use here coursework class create dbset. when scaffold use createcourseviewmodel.     public dbset<student> students { get; set; } 

if want use createcourseviewmodel, have change line above. think put viewmodel suffix purpose of createcourseviewmodel wrap classes displaying in view.