NoReverseMatchを解決する方法

前提・実現したいこと

djangoでリンクの設定をしたところ「Reverse for 'detail' not found. 'detail' is not a valid view function or pattern name.」とエラーが出てしまいました。
このエラーを解消したいです。

発生している問題・エラーメッセージ

Reverse for 'detail' not found. 'detail' is not a valid view function or pattern name.

該当のソースコード

#list.html

{% extends 'base.html' %}

{% block header %}
{% endblock header %}

{% block content %}

    <dev class='container'>
    {% for item in object_list %}
    <div class="card">
        <h5 class="card-header">{{ item.category }}</h5>
        <div class="card-body">
          <h5 class="card-title">{{ item.title }}</h5>
          <h6 class="card-title">{{ item.postdate }}</h6>
          <h6 class="card-title">{{ item.content }}</h6>
          <a href="{% url 'detail' item.pk %}" class="btn btn-primary">詳細へ</a>
        </div>
    </div>
    {% endfor %}
    </dev>
{% endblock content %}

#APPのurls.py
from django.urls import path
from .views import BlogList, BlogDetail, Blogcreate, Blogdelete, Blogupdate

urlpatterns = [
    path('list/', BlogList.as_view(), name='list'),
    path('detail/<int:pk>', BlogDetail.as_view(), name='ditail'),
    path('create/', Blogcreate.as_view(), name='create'),
    path('delete/<int:pk>', Blogdelete.as_view(), name='delete'),
    path('update/<int:pk>', Blogupdate.as_view(), name='update')
]

#setting.py

from pathlib import Path
import os

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/3.1/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'u+aeb2hag)xv-r^((1njs!r(gf_dyoqiq5du(z97jh0$s=$pyg'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'blogpost.apps.BlogpostConfig',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'blogproject.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'blogproject.wsgi.application'


# Database
# https://docs.djangoproject.com/en/3.1/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'db.sqlite3',
    }
}


# Password validation
# https://docs.djangoproject.com/en/3.1/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/3.1/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.1/howto/static-files/

STATIC_URL = '/static/'