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Reverse for 'post-detail' with no arguments not found. 1 pattern(s) tried: ['post/(?P<pk>[0-9]+)/$']

The problem is in blog-app

In views, I define PostDetailList
and In URLs, I define URL for it.

This is what I understand:
According to the error, they are not able to find url for 'post detail that has no argument. I don;t know why they want to find url that has no argument, who ask them to find?
And I am redirecting them to blog-home. I have no idea what's happening.