[Python] scrapy : AttributeError: 'list' object has no attribute 'xpath'

I'am beginner on scrapy. I am trying to iterate ads but I get this error.

I don't know what is wrong in my code.

Here is what I did:

class ScrapAiaSpider(scrapy.Spider):
name = 'scrap_aia'
allowed_domains = ['aia-immobilier.fr']
start_urls = ['http://aia-immobilier.fr/fr/ventes']

def parse(self, response):
ads = response.xpath('//li[@class="property initial"]').getall(),
for ad in ads:
yield {
'type': ad.xpath('./div[@class="titles"]/h2/text()').get(),
'price': ad.xpath('./li[@class="price"]/div/text()').get(),
'room': ad.xpath('./li[@class="room"]/div/text()').get(),
'area': ad.xpath('./li[@class="area"]/div/text()').get()
}


When I run this code, I get an error which explain that list does not have Xpath attribute. Thus I don't understand how I can iterate and get some items for each ad in the list.

Traceback (most recent call last):
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\utils\defer.py", line 132, in iter_errback
yield next(it)
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\utils\python.py", line 354, in __next__
return next(self.data)
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\utils\python.py", line 354, in __next__
return next(self.data)
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\core\spidermw.py", line 66, in _evaluate_iterable
for r in iterable:
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\spidermiddlewares\offsite.py", line 29, in process_spider_output
for x in result:
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\core\spidermw.py", line 66, in _evaluate_iterable
for r in iterable:
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\spidermiddlewares\referer.py", line 342, in <genexpr>
return (_set_referer(r) for r in result or ())
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\core\spidermw.py", line 66, in _evaluate_iterable
for r in iterable:
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\spidermiddlewares\urllength.py", line 40, in <genexpr>
return (r for r in result or () if _filter(r))
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\core\spidermw.py", line 66, in _evaluate_iterable
for r in iterable:
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\spidermiddlewares\depth.py", line 58, in <genexpr>
return (r for r in result or () if _filter(r))
File "C:\Users\kgonc\anaconda3\envs\scraping\lib\site-packages\scrapy\core\spidermw.py", line 66, in _evaluate_iterable
for r in iterable:
File "C:\Users\kgonc\Desktop\Projets\scrap_immo\aia-immobilier.fr\scrap_immo\spiders\scrap_aia.py", line 18, in parse
'type': ad.xpath('./div[@class="titles"]/h2/text()').get(),
AttributeError: 'list' object has no attribute 'xpath'

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