Error Using django-tables2 - Expected table or queryset, not 'str'

Question

I am trying to create some tables for my application using django-tables2 and running into some difficulties. I am using Python 2.7, and Django 1.7. I am following the tutorial,

Answer 1

According to django-tables2 documentation:
In tutorial/views.py, the class name is PersonListView here

I changed the class name from PersonListView to PersonTableView And also made the this change in urls.py.

My problem was solved by doing this.

Why was this problem caused? Please anyone let me know.