Help with django form an ajax, error 500

[Elros Romeo]

Hi, i hope you can help me, im trying to make a django post form without 
reloading the page using ajax, but im getting error 500 when submit, can 
you help me to fix this, this is my code:

*models.py*

class ProductoConcepto(models.Model):
producto = models.ForeignKey(Producto)
orden = models.ForeignKey(Cobro)
cantidad = models.FloatField()


*urls.py*

from django.conf.urls import patterns, include, url
from django.contrib import admin
from cobro import views

urlpatterns = [
    url(r'^cobro/agregar_concepto/$', views.addconcept_product, 
name='add_concepto'),
]

*views.py*


def addconcept_product(request):

    if request.method == 'POST':

        if form.is_valid():
            producto = request.POST['producto']
            orden = request.POST['orden']
            cantidad = request.POST['cantidad']

            ProductoConcepto.objects.create(producto=producto, orden=orden, 
cantidad=cantidad)

            return HttpResponse('')

*template*

        <div class="modal inmodal fade" id="myModal1" tabindex="-1" 
role="dialog"  aria-hidden="true">
            <div class="modal-dialog modal-m">
                <div class="modal-content">
                    <div class="modal-header">
                        <button type="button" class="close" 
data-dismiss="modal">
                            <span aria-hidden="true">&times;</span>
                            <span class="sr-only">Cerrar</span>
                        </button>
                        <h3 class="modal-title">Agregar nuevo concepto</h3>
                    </div>
                    <div class="modal-body">
                        <p>Datos de concepto a agregar:</p>
                        <div class="doctorformstyle">
                        <form id='formulario-modal' method='post' 
enctype='multipart/form-data'>
                            {% csrf_token %}
                            <ul>{{form2.as_p}}</ul>

<!--  rendered form2 fields: <select id="id_producto" 
name="producto"><option value="1" 
selected="selected">object</option></select> -->
<!--  form2 fields: <select id="id_orden" name="orden">
<option value="1" selected="selected">object</option>
</select> -->
<!--  form2 fields: <input id="id_cantidad" name="cantidad" step="any" 
type="number"> -->

                            <div class="row align-center">
                                <input type='submit' name="save1" 
value='Guardar' class="btn btn-w-m btn-primary"/>
                            </div>

                        </form>
</div>
                    </div>
                </div>
            </div>
        </div>

<script type="text/javascript">
    $(document).on('submit', '#formulario-modal', function(e){
            e.preventDefault();
            $.ajax ({
                type: 'POST',
                url: '{% url 'add_concepto' %}',
                data: {
                    producto: $('#id_producto').val(),
                    orden: $('#id_orden').val(),
                    cantidad: $('#id_cantidad').val(),
                    csrfmiddlewaretoken: '{{ csrf_token }}',
                },
                sucess:function(){
                    alert("OK");
                }
            })
    });

</script>

this is the error:  POST http://127.0.0.1:8000/cobro/agregar_concepto/ 500 
(Internal Server Error)

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