Reverse for '' not found. '' is not a valid view function or pattern name
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The syntax for specifying url is {% url namespace:url_name %}. So, check if you have added the app_name in urls.py.
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In my case, I had misspelled the url_name. The urls.py had the following content path('<int:question_id>/', views.detail, name='question_detail') whereas the index.html file had the following entry
<li><a href="{% url 'polls:detail' question.id %}"> {{ question.question_text }}</a></li>
Dayeon Lee | Django & Python Web Developer
The error message "Reverse for bloxd io'' not found. '' is not a valid view function or pattern name" typically occurs when there is an issue with specifying the URL in Django templates.