Scrapy not returning data but instead a JSON error - scrapy

Question

I'm trying to scrape the artists from a site, and them scrape the artists songs and duration , however I keep getting an error and not sure what is causing this error.
Here's what I have tried:
import scrapy
from scrapy.crawler import CrawlerProcess
class LyricalSpider(scrapy.Spider):
name = 'lyrical'
artists = [0, 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',
'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
start_urls = []
for art in artists:
start_urls.append(f'https://www.lyrics.com/artists/{art}')
def start_requests(self):
for url in self.start_urls:
yield scrapy.Request(
url,
callback = self.parse
)
def parse(self, response):
container = response.xpath("//table[#class='tdata']//tbody//tr")
for artists in container:
links = artists.xpath("(.//a)[position() mod 2 = 1]//#href").get()
yield response.follow(
url = response.urljoin(links),
callback = self.parse_artists
)
def parse_artists(self, response):
table = response.xpath("//div[#class='tdata-ext']//table")
for items in table:
yield {
'songs':items.xpath("(.//td)[position() mod 2=1]//text()"),
'duration':items.xpath("(.//td)[position() mod 2=0]/text()")
}
process = CrawlerProcess(
settings = {
'FEED_URI':'artists.jl',
'FEED_FORMAT':'jsonlines'
}
)
process.crawl(LyricalSpider)
process.start()
TypeError: Object of type Selector is not JSON serializable
2022-01-23 14:50:26 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.lyrics.com/artist/H-monroy/2138107522> (referer: https://www.lyrics.com/artists/H)
2022-01-23 14:50:26 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.lyrics.com/artist/U-God/278759> (referer: https://www.lyrics.com/artists/U)