带有Django Rest Auth的自定义注册表单-错误: save()采用1个位置参数，但给出了2个

from rest_framework import serializers
from rest_auth.registration.serializers import RegisterSerializer
from django.contrib.auth.models import User

class CustomRegisterSerializer(RegisterSerializer):
    # 添加自定义字段
    first_name = serializers.CharField(required=True)
    last_name = serializers.CharField(required=True)

    def get_cleaned_data(self):
        return {
            'username': self.validated_data.get('username', ''),
            'password1': self.validated_data.get('password1', ''),
            'email': self.validated_data.get('email', ''),
            'first_name': self.validated_data.get('first_name', ''),
            'last_name': self.validated_data.get('last_name', '')
        }

    def save(self, request):
        user = super().save(request)  # 调用父类的 save 方法
        user.first_name = self.cleaned_data.get('first_name')
        user.last_name = self.cleaned_data.get('last_name')
        user.save()
        return user