JWT-аутентификация для фреймворка Django rest --> error ={ "detail": "Учетные данные для аутентификации не были предоставлены". }

Я использую JWT для аутентификации и не могу заставить эту ошибку исчезнуть...

HTTP 401 Unauthorized
Allow: GET, OPTIONS
Content-Type: application/json
Vary: Accept
WWW-Authenticate: Bearer realm="api"

{
    "detail": "Authentication credentials were not provided."
}

Ниже приведены все мои файлы кода... Я думаю, что ошибка находится в секции simple_jwt в файле настроек, но не могу понять, что именно. Я уже просмотрел несколько ответов на stackoverflow, но ничего не сработало в моем случае.

settings.py

REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework_simplejwt.authentication.JWTAuthentication',
        # 'rest_framework.authentication.TokenAuthentication',
    ),
}


from datetime import timedelta
from django.conf import settings

SIMPLE_JWT = {
    'ACCESS_TOKEN_LIFETIME': timedelta(minutes=30),
    # 'REFRESH_TOKEN_LIFETIME': timedelta(days=1),
    'ROTATE_REFRESH_TOKENS': False,
    'BLACKLIST_AFTER_ROTATION': False,
    'UPDATE_LAST_LOGIN': False,

    'ALGORITHM': 'HS256',
    'SIGNING_KEY': settings.SECRET_KEY,
    'VERIFYING_KEY': None,
    'AUDIENCE': None,
    'ISSUER': None,
    'JWK_URL': None,
    'LEEWAY': 0,

    'AUTH_HEADER_TYPES': ('Bearer',),
    'AUTH_HEADER_NAME': 'HTTP_AUTHORIZATION',
    'USER_ID_FIELD': 'id',
    'USER_ID_CLAIM': 'user_id',
    'USER_AUTHENTICATION_RULE': 'rest_framework_simplejwt.authentication.default_user_authentication_rule',

    'AUTH_TOKEN_CLASSES': ('rest_framework_simplejwt.tokens.AccessToken',),
    'TOKEN_TYPE_CLAIM': 'token_type',

    'JTI_CLAIM': 'jti',

    'SLIDING_TOKEN_REFRESH_EXP_CLAIM': 'refresh_exp',
    'SLIDING_TOKEN_LIFETIME': timedelta(minutes=5),
    'SLIDING_TOKEN_REFRESH_LIFETIME': timedelta(days=1),
}

serializers.py

from rest_framework import serializers
from django.contrib.auth.models import User
from rest_framework_simplejwt.tokens import RefreshToken, Token 
from .models import Book


class UserSerializer(serializers.ModelSerializer):
    name = serializers.SerializerMethodField(read_only=True)
    _id = serializers.SerializerMethodField(read_only=True)
    isAdmin = serializers.SerializerMethodField(read_only=True)

    class Meta:
        model = User
        fields = ['id', '_id', 'email', 'username', 'name', 'isAdmin']

    def get__id(self, obj):
        return obj.id

    def get_isAdmin(self, obj):
        return obj.is_staff   

    def get_name(self, obj):
        name = obj.first_name
        if name == '':
            name = obj.email
        return name

class UserSerializerWithToken(UserSerializer):
    token = serializers.SerializerMethodField(read_only=True)
    class Meta:
        model = User
        fields = ['id', '_id', 'email', 'username', 'name', 'isAdmin', 'token']

    def get_token(self, obj):
        token = RefreshToken.for_user(obj)
        return str(token.access_token)

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = '__all__'

views.py

from django.db.models.fields import BooleanField
from django.shortcuts import render
from django.contrib.auth.models import User
from django.contrib.auth.hashers import make_password
from rest_framework import status

from rest_framework import serializers
from rest_framework.decorators import api_view, permission_classes
from rest_framework.permissions import IsAuthenticated, IsAdminUser
from rest_framework.response import Response

from BL.models import Book
from BL.books import books
from BL.serializers import BookSerializer

from rest_framework_simplejwt.serializers import TokenObtainPairSerializer
from rest_framework_simplejwt.views import TokenObtainPairView

@api_view(['GET'])
@permission_classes([IsAuthenticated])
def getBooks(request):
    books = Book.objects.all()
    serializer = BookSerializer(books, many=True)
    return Response(serializer.data)

@api_view(['GET'])
def getBook(request, bk):
    book = Book.objects.all()
    serializer = BookSerializer(book, many=False)
    return Response(serializer.data)

urls.py

from django.urls import path
from BL.views import book_views as views
from rest_framework_simplejwt.views import (
    TokenObtainPairView,
)

urlpatterns = [

    path('', views.getBooks, name="books"),    
    path('<str:bk>', views.getBook, name="book") 

]

urlpatterns = [

    path('', views.getBooks, name="books"),    
    path('<str:bk>', views.getBook, name="book"),
    path('api/token/', jwt_views.TokenObtainPairView.as_view(), name='token_obtain_pair'),
    path('api/token/refresh/', jwt_views.TokenRefreshView.as_view(), name='token_refresh'),


]