django中配置xadmin时报错metaclass conflict: the metaclass of a derived class must be a (non-strict) subcla

报错信息如下：
原因：
没有修改我们定义的ModelAdmin的继承对象为object或去掉继承

错误代码如下：

@xadmin.sites.register(Comment)
class CommentAdmin(admin.ModelAdmin):
list_display = ["target", "nickname", "content", "website", "created_time"]

应修改为

@xadmin.sites.register(Comment)
class CommentAdmin(object):
list_display = ["target", "nickname", "content", "website", "created_time"]
或者：
@xadmin.sites.register(Comment)
class CommentAdmin:
list_display = ["target", "nickname", "content", "website", "created_time"]