NoReverseMatch

gistfile1.txt

# views.py
# ========
def add_file(request, project_id):
    if request.method == 'POST':
        form = VennCsvForm(request.POST, request.FILES)
        if form.is_valid():
            new_file = VennCsv(file=request.FILES['file'])
            new_file.user = request.user
            new_file.project = get_object_or_404(VennProject, pk=project_id)
            new_file.save()

            return JsonResponse({'redirect_url': reverse('project_details', kwargs={'project_id': new_file.project.id})})
    else:
        form = VennCsvForm()

    data = {'form': form}
    return render(request, reverse('add_file'), {'project_id':project_id, 'data':data})


# urls.py
=========
url(r'venn/add_file/(?P<project_id>\d+)/$', add_file, name='add_file'),

# add_file.html
<form id="my-awesome-dropzone" class="dropzone" action="{% url 'add_file' project_id=project.id %}" method="post"
	enctype="multipart/form-data">
		{% csrf_token %}
</form>