NoReverseMatch problems

When I run the app (after already creating the diff categories and sub-categories in the admin page) I try to click on the categories link on the nav-bar and they show up, however, the problem is when i click on the specific category link. Here is when it sends the NoReverseMath error. The following image is an image from my terminal showing the error:

The following is my code:
Thanks in advance! (app folder)

from django.urls import path
from . import views

urlpatterns = [
    path('', views.home,name="home"),
    path('show_category/<category_id>', views.show_category,name="show_category"),

from django.db import models
from django.urls import reverse
import uuid

# Create your models here.
class ClothingItem(models.Model):
    category = models.ForeignKey('Categorie',null=True,on_delete=models.CASCADE)
    sub_category = models.ForeignKey('SubCategorie',null=True,on_delete=models.CASCADE)
    name = models.CharField( max_length=50)
    brand = models.ForeignKey('Brand',null=True,on_delete=models.CASCADE)
    description = models.TextField(max_length=1000,blank=True)

    def __str__(self):
    def get_absolute_url(self):
        return reverse("clothingitem_detail", kwargs={"pk":})

class Categorie(models.Model):
    category = models.CharField(max_length=100)
    def __str__(self):
        return self.category
class SubCategorie(models.Model):
    sub_category = models.CharField('Clothing Type',max_length=100)
    def __str__(self):
        return self.sub_category

class Brand(models.Model):
        brand_name = models.CharField(max_length=100)
        class Meta:
            ordering = ['brand_name']
        def get_absolute_url(self):
            return reverse("brand_detail", kwargs={"pk":})
        def __str__(self):
            return self.brand_name

from django.shortcuts import render
from .models import ClothingItem,Categorie,SubCategorie

# Create your views here.

def home(request):
    return render(request,'item_type/home.html',{})

def show_category(request, category_id):
    category = Categorie.objects.get(id=category_id)
    sub_category = SubCategorie.objects.all()
    context = {'category':category,'sub_category':sub_category}
    return render(request, 'item_type/show_category.html',context)

def all_items(request):
    items_list = ClothingItem.objects.all()
    return render(request, 'item_type/clothing_list.html',{'items_list':items_list})

def category(request):
    category_list = Categorie.objects.all()
    return render(request, 'item_type/categories.html',{'category_list':category_list})


<!doctype html>
<html lang="en">
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Notte e Mattina</title>
    <link href="" rel="stylesheet" integrity="sha384-GLhlTQ8iRABdZLl6O3oVMWSktQOp6b7In1Zl3/Jr59b6EGGoI1aFkw7cmDA6j6gD" crossorigin="anonymous">
    {% include 'item_type/navbar.html' %}
    <div class="container">
    {% block content %}
    {% endblock  %}

    <script src="" integrity="sha384-w76AqPfDkMBDXo30jS1Sgez6pr3x5MlQ1ZAGC+nuZB+EYdgRZgiwxhTBTkF7CXvN" crossorigin="anonymous"></script>



{% extends 'item_type/base.html' %}

{% block content %}
    {% for i in category_list %}
       <a href="{% url 'show_category' %}"> {{i}}</a>
    {% endfor %}
{% endblock  %}


{% extends 'item_type/base.html' %}

{% block content %}
    <h1>List of items</h1>
        {% for i in items_list %}
            <div class="card">
                <div class="card-header">
                <div class="card-body">
                <h5 class="card-title">{{i.sub_option}}</h5>
                <p class="card-text"> <strong> Brand: {{i.brand}} </strong>
        {% endfor %}
{% endblock  %}


{% extends 'item_type/base.html' %}

{% block content %}
{% endblock  %}


<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <div class="container-fluid">
      <a class="navbar-brand" href="{% url 'home' %}">Notte e Mattina</a>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
          <li class="nav-item">
            <a class="nav-link" href="{% url 'categories' %}">Categories</a>
          <li class="nav-item">
            <a class="nav-link" href="{% url 'list_items' %}">All Items</a>
        <form class="d-flex" role="search">
          <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
          <button class="btn btn-outline-success" type="submit">Search</button>

show_category.html (im still working on this specific view and page)

{% extends 'item_type/base.html' %}

{% block content %}
    {% for i in sub_category %}
    {% endfor %}
{% endblock  %}

Sorry for not adding it in the original post, here too is another picture of the error directly from the page

The identifier category does not exist at that line. I’m going to guess that you probably want based upon the identifier you’re using in your loop.

Thank you very much, it worked! And also thank you for the very prompt reply!