retrieving data with api controller

i have the code at StudentController:

private StudentContext _context= new StudentContext();

       [Route("api/student/GetStudents")]
        public IEnumerable<Student> GetStudents()
        {
            return _context.Students;
        }

it would return all the students.

at view i have the code that take this returned function

function customersController($scope, $http) {$http.get("/api/student/getStudents")
        .success(function (response) { $scope.students = response; });

and angular class that iterate over the list:

<table class="table table-striped"><thead><tr><td><b>ID</b></td><td><b>Nome</b></td></thead><tbody><tr ng-repeat="student in students" class="ng-scope"><td>{{ student.Id }}</td><td>{{ student.Name }}</td><td><button class="btn btn-primary" ng-click="selecionar(student)"><span class="glyphicon glyphicon-pencil"></span>  Selecionar</button><button class="btn btn-primary" ng-click="deletar(customer.Id)"><span class="glyphicon glyphicon-remove"></span> Deletar</button></td></tr></tbody></table>

When i run the view i receive a error instead  data

here is the error:

ExceptionMessage: "The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; charset=utf-8'."
ExceptionType: "System.InvalidOperationException"
InnerException: {Message: "An error has occurred.",…}
Message: "An error has occurred."
StackTrace: null