如何解决Django ModuleNotFoundError：没有名为“multiselectfield”的模块？

正如标题所说。当我在本地运行服务器时一切正常，但是当我部署时出现此错误。第一次发帖，我对 Django 很陌生。我已经使用 pip3 重新安装了 multiselectfield 并检查了版本。我还运行了 pip freeze 来检查所有包，我可以看到多选字段在那里。我检查了我的迁移，我可以看到它已添加到数据库中。

 File "manage.py",line 22,in <module>
    main()
  File "manage.py",line 18,in main
    execute_from_command_line(sys.argv)
  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py",line 401,in execute_from_command_line
    utility.execute()
  File "/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py",line 377,in execute
    django.setup()
  File "/app/.heroku/python/lib/python3.6/site-packages/django/__init__.py",line 24,in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/app/.heroku/python/lib/python3.6/site-packages/django/apps/registry.py",line 91,in populate
    app_config = AppConfig.create(entry)
  File "/app/.heroku/python/lib/python3.6/site-packages/django/apps/config.py",line 90,in create
    module = import_module(entry)
  File "/app/.heroku/python/lib/python3.6/importlib/__init__.py",line 126,in import_module
    return _bootstrap._gcd_import(name[level:],package,level)
  File "<frozen importlib._bootstrap>",line 994,in _gcd_import
  File "<frozen importlib._bootstrap>",line 971,in _find_and_load
  File "<frozen importlib._bootstrap>",line 953,in _find_and_load_unlocked
ModuleNotFoundError: No module named ''multiselectfield''


from django.db import models
from django.urls import reverse
from phone_field import PhoneField
from multiselectfield import MultiSelectField
import datetime
WEEKS = (
    (''1'',''Week 1''),(''2'',''Week 2''),(''3'',''Week 3''),(''4'',''Week 4''),(''5'',''Week 5''),(''6'',''Week 6''),(''7'',''Week 7''),(''8'',''Week 8''),(''9'',''Week 9''),(''10'',''Week 10''),(''11'',''Week 11''),)

# Create your models here.
class Parent(models.Model):
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)
    phone = PhoneField(blank=True,E164_only=False)
    email = models.CharField(max_length=100)
    

    def __str__(self):
        return self.first_name
    def get_absolute_url(self):
        return reverse(''parent_details'',kwargs={''parent_id'': self.id})

class Summer(models.Model):
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)
    child_name = models.CharField(max_length=100)
    week_number = MultiSelectField(
        choices = WEEKS,default = 1
        )
    phone = PhoneField(blank=True,E164_only=False)
    email = models.CharField(max_length=100)

    def __str__(self):
        return self.first_name
    def get_absolute_url(self):
        return reverse(''summer_details'',kwargs={''summer_id'': self.id})
import os
from pathlib import Path
from dotenv import load_dotenv,find_dotenv
load_dotenv(find_dotenv())

# 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 = os.getenv(''SECRET'')

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

BASE_URL = ''https://www.sdkidzkamp.com''


ALLOWED_HOSTS = [''www.sdkidzkamp.com'',''sdkidzkamp.com'']


# GOOGLE_ANALYTICS_MODEL = True

# Application deFinition

INSTALLED_APPS = [
    # ''google_analytics'',''phone_field'',''bootstrap5'',''crispy_forms'',''main_app'',''django.contrib.admin'',''django.contrib.auth'',''django.contrib.contenttypes'',''django.contrib.sessions'',''django.contrib.messages'',''django.contrib.staticfiles'',''multiselectfield'',]

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'',]

SECURE_PROXY_SSL_HEADER = (''HTTP_X_FORWARDED_PROTO'',''https'')

SECURE_SSL_REDIRECT = True

ROOT_URLconf = ''kidzkamp.urls''

TEMPLATES = [
    {
        ''BACKEND'': ''django.template.backends.django.DjangoTemplates'',''Dirs'': [],''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 = ''kidzkamp.wsgi.application''


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

DATABASES = {
    ''default'': {
        ''ENGINE'': ''django.db.backends.postgresql'',''NAME'': ''kidzkamp'',}
}


# 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 = ''America/Los_Angeles''

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_ROOT = os.path.join(BASE_DIR,''staticfiles'')
STATIC_URL = ''/static/''

import django_heroku
django_heroku.settings(locals())

解决方法

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