Reverse for 'company_delete' with arguments '('',)' not found. 1 pattern(s) tried: ['company/(?P<pk>\\d+)/delete/$'] - django

Question

I am getting:
django.urls.exceptions.NoReverseMatch: Reverse for 'company_delete' with arguments '('',)' not found. 1 pattern(s) tried: ['company/(?P\d+)/delete/$']
and in my console it is showing:
- Failed to load resource: the server responded with a status of 500 (Internal Server Error)
My views.py
def company_delete(request,pk):
data = dict()
company = get_object_or_404(Company,pk=pk)
if request.method == "POST":
company.delete()
data['form_is_valid'] = True
companies = Company.objects.all()
data['company_list'] = render_to_string('company_list_2.html',{'companies': companies})
else:
context = {'company': company}
data['html_form'] = render_to_string('company_delete.html',context,request=request)
return JsonResponse(data)
my urls.py
urlpatterns = [
url(r'^company/$', views.company_list, name='company_list'),
url(r'^company/create/$', views.company_create, name='company_create'),
url(r'^company/(?P<pk>\d+)/update/$', views.company_update, name='company_update'),
url(r'^company/(?P<pk>\d+)/delete/$', views.company_delete, name='company_delete'),
]
my company_list_2.html
{% for c in companies %}
<tr>
<td>{{ c.name }}</td>
<td>{{ c.description }}</td>
<td>{{ c.website }}</td>
<td>{{ c.address }}</td>
<td>{{ c.phone }}</td>
<td>{{ c.email }}</td>
<td>{{ c.contact }}</td>
<td>
<button class="btn btn-warning show-form-update" data-url="{% url 'company_update' c.pk %}">
<span class="glyphicon glyphicon-pencil"></span>
Edit
</button>
</td>
<td>
<button class="btn btn-danger show-form-delete" data-url="{% url 'company_delete' c.pk %}">
<span class="glyphicon glyphicon-trash"></span>
Delete
</button>
</td>
</tr>
{% empty %}
<tr>
<td colspan="7" class="text-center bg-warning">No Company</td>
</tr>
{% endfor %}
my company_delete.html
{% load crispy_forms_tags %}
<form method="post" data-url="{% url 'company_delete' c.pk %}" class="delete-form">
{% csrf_token %}
<div class="modal-header">
<h3 class="modal-title" >Delete Company</h3>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<p class="lead"> Are you sure you want to delete this company <strong>{{ c.name }}</strong></p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="submit" class="btn btn-danger">Delete Company</button>
</div>
</form>

Answer 1

As say #Ivan Starostin just put company.pk instance c.pk in your url form
<form method="post" data-url="{% url 'company_delete' company.pk %}" class="delete-form">
...
</form>