What causes a 404 error in django?

Question

Django

Gives an error on startup

#mysite - urls

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('train/', include('train.urls')),
    path('', include('main.urls')),
]

#train-urls

from django.urls import path
from . import views

urlpatterns = [
    path('train/', views.train),
]

#train-views

from django.shortcuts import render

# Create your views here.
def train(request):
  return render(request, 'train/train.html')

Answer 1

You have both urls.py written in such a way that the request must be to the address/train/train/