How to use Django url template tag with variable as url path

I encountered a No Reverse Match Error in trying to render a template. Can you explain what this No Reverse Match Error mean for easier understanding and how to solve the error?

models.py

from django.contrib.sites.models import Site
from django.contrib.gis.db import models
from django.utils.crypto import get_random_string
from django.contrib.gis.geos import GEOSGeometry,Point
from django.contrib.auth.models import AbstractUser
from django.shortcuts import render
# Create your models here.
class User(AbstractUser):
    pass

geos_pnt=Point(4314498.56, 1003834.600,srid=3857)
#pnt=GEOSGeometry('POINT(4314498.56, 1003834.600)').wkt
class Apartment(models.Model):
    SUBCITY_CHOICES = (
    ('ADK', 'Addis Ketema'), ('AKLTY', 'Akaki-Kality'), ('ARD', 'Arada'), ('BL', 'Bole'), ('GL', 'Gulele'),
    ('KLF', 'Kolfe-Keranio'), ('LDTA', 'Ledeta'), ('NFS', 'Nefas Silk'), ('YK', 'Yeka'))
    apt_id = models.CharField(str(SUBCITY_CHOICES)+"-"+get_random_string(length=4), max_length=8,primary_key=True)
    location = models.PointField(default=geos_pnt,extent=(4282586.10,996190.90,4346411.02,1011478.31),
                                    blank=True, null=True, srid=3857, help_text="Point(longitude latitude)")
    no_bedrooms= models.IntegerField(null=True)
    apt_area = models.IntegerField(default=0, null=True)
    apt_cost = models.IntegerField(default=0, null=True)
    apt_subcity = models.CharField(default='Nefas Silk',max_length=100, choices=SUBCITY_CHOICES,null=True)
    register_date = models.DateTimeField('Register Date',auto_now_add=True,null=True)
    slug = models.SlugField(unique=True)
    objects = models.Manager()
    sites =models.ManyToManyField(Site)

    #change points from apt_rent_db to kml
    def pointkml(self):
        points = Apartment.objects.kml()
        return render("placemarks.kml", {'places': points})
    def get_absolute_url(self):
        return reverse('apartment_create', kwargs={'pk': self.pk, 'apt_id': self.apt_id.pk})

    def save(self, *args, **kwargs):
        #self.Latitude = self..y
        #self.Longitude = self.location.x
        self.slug = slugify(self.apt_id)
        super(Apartment, self).save(*args, **kwargs)

    class Meta:
       # order of drop-down list items
       verbose_name = ("Apartment")
       verbose_name_plural = ("Apartments")
       ordering = ('apt_cost',)
       app_label = 'rent_app'

    def __unicode__(self):
        return self.apt_id

urls.py:

from django.urls import path
from . import views
app_name = 'rent_app'


    urlpatterns = [

            path('', views.IndexView.as_view(), name='index'),
            path('apartment_create/<slug:apt_id>)', views.ApartmentCreate.as_view(), name='apartment_create'),
            path('apartments/<int:pk>/', views.ApartmentUpdate.as_view(), name='apartment_update'),
            path('apartments/<int:pk>/delete/', views.ApartmentDelete.as_view(), name='apartment_delete'),
             ]

views.py:

from django.urls import reverse_lazy
from django.views import generic
from django.views.generic.edit import CreateView, DeleteView, UpdateView
from .models import Apartment
from .forms import ApartmentCreateForm


class IndexView(generic.ListView):

    template_name = 'djnago_leaflet.html'
    context_object_name = 'latest_apartments_list'

    def get_queryset(self):

        """Return the last five published apartments."""

        return Apartment.objects.order_by('-register_date')[:5]

class ApartmentCreate(CreateView):
    template_name = 'rent_app/apartment-create-success.html'
    form_class = ApartmentCreateForm
    fields = ['apt_id','location','apt_area','apt_cost']
    success_url= reverse_lazy('apartment-create')

class ApartmentUpdate(UpdateView):
    model = Apartment
    fields = ['apt_id','location','apt_area', 'apt_cost']
    template_name='index_leaflet.html'
    template_name_suffix='apartments'

class ApartmentDelete(DeleteView):
    model = Apartment
    template_name = 'index_leaflet.html'
    template_name_suffix='apartments'
    success_url = reverse_lazy('apartment-list')

the html:

<html>
  <head>
   {% leaflet_js plugins="forms" %}
   {% leaflet_css plugins="forms" %}
  </head>


  <body>

    {% leaflet_map "map" callback="window.map_init_basic" %}
    <h2>Edit Apartment ID {{ Apartment.apt_id }}</h2>
    <h2>Edit Apartment Location {{ Apartment.location }}</h2>
    <form action="{% url 'rent_app:apartment_create' apt_id %}" method="post">
        {% csrf_token %}
        {{ form }}
        <input type="submit"/>
    </form>
  </body>
</html>