[Fixed]-An NoReverseMatch Error

You are most likely using a url filter tag in your template. You need to pass the post_id as a parameter in your url filter tag.

{%  url 'edit' post_id %}

On a side note, you should preferably use reverse or reverse_lazy to get url’s rather than hard coding them

from django.core.urlresolvers import reverse_lazy, reverse
HttpResponseRedirect(reverse('url_name'))