Generic detail view DetailView must be called with either an object pk or a slug in the URLconf.

Using Django Getting Started
2

The specific error message is telling you what the issue is.

Note how the URLs are defined in the tutorial at Writing your first Django app, part 4 | Django documentation | Django

Your definition of the url is:

You have changed the name of the url parameter without making the other changes necessary to make this work.

(Also see Single object mixins | Django documentation | Django)

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