title: django form: ModelForm has no model class specified
body: <p>I am working on an existing project and I wanna add a django form to a page. The application is called wireless, and under wireless directory I have forms.py, with some code like:</p>
  
  <pre><code>from django import forms    
  class WirelessScanForm(forms.ModelForm):
          time = forms.DateTimeField(label='When', widget=AdminSplitDateTime())
          prob = forms.ChoiceField(choices=[x.sniffer.plug_ip for x in
                           SurveyRouterSniffer.objects.all()])
  </code></pre>
  
  <p>In views.py I do the following:</p>
  
  <pre><code>from wireless import forms
  
  form = forms.WirelessScanForm()
  return render_response(request, 'wireless/crack.html',
              { 'scheduledScans' : scheduledScans,
                'form': form})
  </code></pre>
  
  <p>I'm very new to django so any help would be thankful. </p>