how to view traceback?

[mohamadiank]

I create new spider class in my app
when i want to test in return Unhandled error in Deferred without any traceback
how can i see trace back?

spider class:

class DetailSpider(DjangoSpider):
    name = 'detail_spider'
    def __init__(self, *args, **kwargs):
        self._set_ref_object(Movie, **kwargs)
        self.scraper = self.ref_object.scraper
        self.scrape_url = self.ref_object.url
        self.scheduler_runtime = self.ref_object.scraper_runtime
        self.scraped_obj_class = Details
        self.scraped_obj_item_class = DetailItem
        super(DetailSpider, self).__init__(self, *args, **kwargs)

I execute this commad:
scrapy crawl detail_spider -a id=id

and return this

2018-04-08 18:33:23 [scrapy.utils.log] INFO: Versions: lxml 4.2.1.0, libxml2 2.9.8, cssselect 1.0.3, parsel 1.4.0, w3lib 1.19.0, Twisted 17.9.0, Python 3.6.3 (default, Oct  3 2017, 21:45:48) - [GCC 7.2.0], pyOpenSSL 17.5.0 (OpenSSL 1.1.0h  27 Mar 2018), cryptography 2.2.2, Platform Linux-4.13.0-32-generic-x86_64-with-Ubuntu-17.10-artful
2018-04-08 18:33:23 [scrapy.crawler] INFO: Overridden settings: {'BOT_NAME': 'open_news', 'SPIDER_MODULES': ['dynamic_scraper.spiders', 'web.scraper'], 'USER_AGENT': 'open_news/1.0'}
2018-04-08 18:33:23 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.memusage.MemoryUsage',
 'scrapy.extensions.logstats.LogStats']
Unhandled error in Deferred: