[Django]-Django 1.8 error: 'NoneType' object is not callable

in views.py, the context is one dictionary !

return render(request,'result_list.html',{'company':company,'region':region, 'employee':employee, 'sales':sales, 'departments':departments})


<div class="basicinfo">         <!--Entry Form information submitted by user-->

    <table border="1" cellpadding="1">
    <tr>
        <td align="left">Company</td>
        <td>{{company}}</td>
    </tr>
    <tr>
        <td align="left">Region</td>
        <td>{{region}}</td>
    </tr>
  </table>

<!--Showing the filtered result in database-->  
<td><table border="0" cellspacing="10" cellpadding="10">
<tr><b>Sales</b></tr>
<td bgcolor="#F0F0F0"> {{sales}}</td>

</tr>
<tr><b>Employee</b></tr>
<tr>
<td bgcolor="#F0F0F0"> {{employee}}</td>

</tr>
<tr><b>Departments</b></tr>
<td bgcolor="#F0F0F0"> {{departments}}</td>
</td></table>

You are writing way too much code for a simple form.

Create a simple form; which is just a search for your second view:

class SearchForm(forms.Form):
    company = forms.CharField()
    region = forms.CharField()

Create a view to display the form:

def search_form(request):
    form = SearchForm(request.GET)
    if form.is_valid():
        company = form.cleaned_data['company']
        region = form.cleaned_data['region']
        url = '{}?company={}&region={}'.format(reverse('result-list'), company, region)
        return redirect(url)
    return render(request, 'form.html', {'form': form})

Create a view to display the results:

def show_results(request):
    company = request.GET.get('company')
    region = request.GET.get('region')
    if company is None or region is None:
        return redirect('input')

    # Your normal logic here
    queryset=Result.objects.filter(company=company,region=region)
    sales=Result.objects.aggregate(Sum('sales'))
    employee=Result.objects.aggregate(Sum('employee'))
    departments=Result.objects.aggregate(Sum('departments'))

    return render(request, 'results.html', {'sales': sales,
                                            'employee': employee,
                                            'departments': departments,
                                            'queryset': queryset})            

If I understand correctly, when you send a GET request to

127.0.0.1:8000/input/

then you get the error. Do you get the same error when you send a post request to that URL? Try changing input.html to this:

<div class="field">
    <!-- Check if the errors exist first before calling them. 
         If youre sending a GET request, then form errors will 
         probably not exist. -->
        {% if form.company.errors %}
            {{ form.company.errors }}
            <label for="{{ form.company.id_for_label }}">Company:</label>
        {% endif %}
        {{ form.company }}
</div>

<div class="field" >
<label> Select the Region:
    {{ form.region }}
        <!-- over here, are you sure form.region.choices exists? Can you
             post your model / model form so that we can verify that
             form.region.choices exists? -->
        {% for region in form.region.choices %}
        <option value="region" name= "region" id="id_region">{{region}} </option>
        {% endfor %}
</label>
</div>

Let me know if you still get the error after using this code. In the code above, I left a comment mentioning to verify that form.region.choices exists. Can you upload your model and model form so that we can verify that form.region.choices exists?