Validation failed for one or more entities

Question

Hai 

 

Am trying AngularJS - Crud operation so when i save data in database 

 

Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.

this error is coming up 

and am using JsonResult like

 

public JsonResult AddStudent(DataAccess.Student student)

{

//try

//{

if (ModelState.IsValid)

{

sampleEntity.Students.Add(student);

sampleEntity.SaveChanges();

return Json(new { status = "Student added successfully" });

}

}

 

how to slove this plz help me

 

check following attachment