Multi create not working ?

[kentuck13]

class SectionSerializer(TranslatableModelSerializer):
    translations = TranslatedFieldsField(shared_model=Section)
    section_group = SectionGroupSerializer(many=True)

    class Meta:
        model = Section
        fields = (
            'translations',
            'min_age',
            'image',
            'section_group'
        )

    @transaction.atomic
    def create(self, validated_data):
        section_group = validated_data.pop('section_group')
        section = super().create(validated_data)

        section_group = [{**i, 'section': section.id} for i in section_group]
        serializer = SectionGroupSerializer(
            data=section_group,
            many=True
        )
        serializer.is_valid(raise_exception=True)
        serializer.save()

When i ran this code, i got exception:
self.model._meta.object_name, obj, TypeError: 'SectionGroupTranslation' instance expected, got 'uz'