How to fix this: Reverse for 'post_detail' with keyword arguments '{'slug': ''}' not found. 1 pattern(s) tried: ['(?P[-a-zA-Z0-9_]+)/$']?

Question

From the error message it would appear to me that a dictionary variable is required: {\'slug\': \'\'}\' . Even if this supposition is correct, I am not sure what variable is be