[Python] Using Scrapy I get LookupError: unknown encoding: 'b'utf8''

Im learning how to use Scrapy but when I try to export to csv I get a LookupError: unknown encoding: 'b'utf8''

I made an example with Stack Overflow (only for learning) and tried to scrap first page of questions and then export to csv. But I get an empty CSV and the error on my terminal is:

2025-03-16 12:07:52 [scrapy.core.scraper] ERROR: Spider error processing <GET https://stackoverflow.com/questions> (referer: None) Traceback (most recent call last): File "C:\Users\fvarelaa\AppData\Local\anaconda3\Lib\site-packages\scrapy\utils\defer.py", line 327, in iter_errback yield next(it) ^^^^^^^^

LookupError: unknown encoding: 'b'utf8'' 2025-03-16 12:07:52 [scrapy.core.engine] INFO: Closing spider (finished) 2025-03-16 12:07:52 [scrapy.extensions.feedexport] INFO: Stored csv feed (0 items) in: video.csv 2025-03-16 12:07:52 [scrapy.statscollectors] INFO: Dumping Scrapy stats:

from scrapy.item import Field
from scrapy.item import Item
from scrapy.spiders import Spider
from scrapy.selector import Selector
from scrapy.loader import ItemLoader

class Pregunta(Item):
id = Field()
pregunta = Field()
descripcion = Field()

class StackOverFlowSpider(Spider):
name = "MiPrimerSpider"
custom_settings = {
"USER_AGENT": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
}

start_urls = ["https://stackoverflow.com/questions"]

def parse(self, response):
sel = Selector(response)
preguntas = sel.xpath("//div[contains(@id,'questions')]//div[@class='s-post-summary js-post-summary']")

for pregunta in preguntas:
item = ItemLoader(item = Pregunta(), selector = pregunta)
item.add_xpath('pregunta','.//h3/a/text()')
item.add_xpath('descripcion',".//div[contains(@class,'excerpt')]/text()")
item.add_value('id', 1)

yield item.load_item()
# scrapy runspider Intro_Scrapy.py -o video.csv

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