404 Error for Multiple Scrape

When using the Multiple Scrape portion of WP Scraper, it simply will not pick up any pages added on the first step (where you list the webpages). I’ve listed a number of webpages from various sites in my niche, then proceeded to the 2nd step where you mark title, content, etc, but when I click on the “title button” for instance, I get a 404 page for each site.