Flask, url dynamic nav

I am trying to get my Flask urls to work, currently, I have this navigation:

def category(category):

def subcategory(category, subcategory):

The idea is that one would navigate, from one category to another etc. Also, support e.g.: health/fasting/fasting-is-good-for-you

But, I cannot seem to get the url_for() to work, what am I doing wrong, any help is appreciated. Thanks a lot in advance!

EDIT: I keep getting the following error: "werkzeug.routing.BuildError

werkzeug.routing.BuildError: Could not build url for endpoint ‘category’. Did you forget to specify values [‘category’]? "


<a href="{{url_for('category')}}/{{url_for('subcategory')}}/{{slug}}">

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