Problem with User Field

[efeniks]

Hello!

I have problem with uploads files. I add user field:

class Picture(models.Model):
user = models.ForeignKey(NormalUser)
file = models.ImageField(upload_to="pictures")

I found this solution for views.py in internet:

class PictureCreateView(CreateView):
model = Picture
fields = "all"

def form_valid(self, form):
    self.object = form.save(commit=False)
    self.object.user = self.request.user
    self.object.save()
    files = [serialize(self.object)]
    data = {'files': files}
    response = JSONResponse(data, mimetype=response_mimetype(self.request))
    response['Content-Disposition'] = 'inline; filename=files.json'

    return response

But when I add image i see this:

Application don't upload file. Stop in 100%. What is the problem?

Thank You!
efeniks