Exception Value: column user_id is not unique

I'm Django noob so please bear with me. I am trying to make a simple gallery for usres so that they can upload pics to their profile. Here are the relevant parts:

models.py

def get_uplaod_file_name(instance,filename):      return 'uploaded_files/%s_%s' % (str(time()).replace('.','_'), filename)    class UserPic(models.Model):      user = models.ForeignKey(User, unique=False)      picfile = models.FileField(upload_to=get_uplaod_file_name)        @models.permalink      def get_absolute_url(self):          return ('view_pirate', None, {'user': self.account.user})            def __unicode__(self):          return unicode(self.picfile.name) 

views.py

@login_required  def list(request):      # Handle file upload      if request.method == 'POST':          picform = PicForm(request.POST, request.FILES)          if picform.is_valid():                newpic = UserPic(picfile = request.FILES['picfile'])              newpic = picform.save(commit=False)              newpic.user = request.user              newpic.save()              message = "file %s is uploaded" % newpic              userpics = UserPic.objects.all()                return render_to_response('userpics/listpics.html',                                        {'userpics': userpics, 'picform': picform},                                        context_instance=RequestContext(request)      )          else:          picform = PicForm() # A empty, unbound form          userpics = UserPic.objects.all()          return render_to_response(          'userpics/listpics.html',          {'userpics': userpics, 'picform': picform},          context_instance=RequestContext(request)      )

The app works fine for one image upload but the problem is that whenever a user tries to upload a second image, Django gives this error:

column user_id is not unique

I have also tried 'unique= True on a fresh database in the model, but still got stocked at this problem. Appreciate your hints.

Thanks

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