我在使用authenticate ()方法的django认证系统上有一个错误

# settings.py
AUTHENTICATION_BACKENDS = [
    'django.contrib.auth.backends.ModelBackend',
    # 其他认证后端
]

# models.py
from django.contrib.auth.models import AbstractUser

class CustomUser(AbstractUser):
    # 自定义字段和方法
    pass

# settings.py
DEBUG = True

# views.py
from django.contrib.auth import authenticate, login
from django.shortcuts import render, redirect

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect('home')
        else:
            return render(request, 'login.html', {'error': 'Invalid credentials'})
    return render(request, 'login.html')