Как обьявить аргумент fields в Django?

class createListing(forms.ModelForm):
    title = forms.CharField(label= "Title", max_length = 32)
    description = forms.CharField(label= "Description", max_length = 499)
    price = forms.IntegerField(label = "Price")
    
    class Meta(forms.ModelForm):
        model = Category
        fields = "__all__"

Вот сама ошибка:

django.core.exceptions.ImproperlyConfigured: Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is prohibited; form createListing needs updating.

UPD: Решил проблему: надо было перезапустить сервер