Server Error (500)と出てしまうが対処方法がわからない

実現したいこと

Server Error (500)が出ずに正常にWebアプリが表示されるようになる

発生している問題・分からないこと

Djangoで作成したWebアプリをrender.comを通じて、公開するときにserver　Error（500）が表示される。
原因を調査し、改善しているが解決方法が不明。
以下ファイル構成である
salesproject
L accounts（フォルダ）
L sales（フォルダ）
L salesproject（フォルダ）
L settings.py
L template（フォルダ）
L build.sh
L manage.py
L render.yaml
L requirements.txt

エラーメッセージ

error
1Server Error (500)

該当のソースコード

settings.py
1import dj_database_url
2from pathlib import Path
3import os
4
5BASE_DIR = os.path.abspath(os.path.join(__file__, '../../../'))
6STATIC_URL = '/static/'
7
8SECRET_KEY = "django-insecure-)-k2$&e-nskyf_7cwr3uqqqnz3n%vsno$c9g_vv=kdi#*n&&gq"
9
10DEBUG = False
11
12ALLOWED_HOSTS = ["*"]
13# Application definition
14
15INSTALLED_APPS = [
16    "django.contrib.admin",
17    "django.contrib.auth",
18    "django.contrib.contenttypes",
19    "django.contrib.sessions",
20    "django.contrib.messages",
21    "django.contrib.staticfiles",
22    "accounts.apps.AccountsConfig",
23    "sales.apps.SalesConfig",
24]
25
26MIDDLEWARE = [
27    "django.middleware.security.SecurityMiddleware",
28    "django.contrib.sessions.middleware.SessionMiddleware",
29    "django.middleware.common.CommonMiddleware",
30    "django.middleware.csrf.CsrfViewMiddleware",
31    "django.contrib.auth.middleware.AuthenticationMiddleware",
32    "django.contrib.messages.middleware.MessageMiddleware",
33    "django.middleware.clickjacking.XFrameOptionsMiddleware",
34    "whitenoise.middleware.WhiteNoiseMiddleware",
35]
36
37ROOT_URLCONF = "salesproject.urls"
38
39TEMPLATES = [
40    {
41        "BACKEND": "django.template.backends.django.DjangoTemplates",
42        "DIRS": [os.path.join(BASE_DIR, 'templates')],
43        "APP_DIRS": True,
44        "OPTIONS": {
45            "context_processors": [
46                "django.template.context_processors.debug",
47                "django.template.context_processors.request",
48                "django.contrib.auth.context_processors.auth",
49                "django.contrib.messages.context_processors.messages",
50            ],
51        },
52    },
53]
54
55WSGI_APPLICATION = "salesproject.wsgi.application"
56
57DATABASES = {
58    "default": {
59        "ENGINE": "django.db.backends.sqlite3",
60        "NAME": os.path.join(BASE_DIR, 'db.sqlite3'),
61    }
62}
63
64if not DEBUG:
65    DATABASES = {
66    "default": dj_database_url.config (
67        #Replace this value with your local database's connection string.
68        default = 'postgresql://postgres:postgres@localhost:5432/salesproject',
69        conn_max_age=600
70    )
71}
72
73AUTH_PASSWORD_VALIDATORS = [
74    {
75        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
76    },
77    {"NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",},
78    {"NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",},
79    {"NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",},
80]
81
82LANGUAGE_CODE = "ja"
83
84TIME_ZONE = "Asia/Tokyo"
85
86USE_I18N = True
87
88USE_TZ = True
89
90
91if not DEBUG:
92    STATIC_ROOT = os.path.join(BASE_DIR, "staticfiles")
93    STATICFILES_STORAGE = "whitenoise.storage.CompressedManifestStaticFilesStorage"
94
95DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
96
97AUTH_USER_MODEL = 'accounts.User'
98
99LOGIN_REDIRECT_URL = "index"
100LOGOUT_REDIRECT_URL = 'index'

build.sh
1set -o errexit
2pip install -r requirements.txt
3python3 manage.py collectstatic --no-input
4python3 manage.py migrate
5python3 manage.py superuser

render.yaml
1databases:
2  - name: mysitedb
3    plan: free
4    databaseName: sales
5    user: sales
6
7services:
8  - type: web
9    plan: free
10    name: salesproject
11    runtime: python
12    buildCommand: "./build.sh"
13    startCommand: "python -m gunicorn salesproject.asgi:application -k uvicorn.workers.UvicornWorker"
14    envVars:
15      - key: DATABASE_URL
16        fromDatabase:
17          name: mysitedb
18          property: connectionString
19      - key: WEB_CONCURRENCY
20        value: 4