Indexation and ads.txt link

Greetings!

So im trying to figure out why our site isn't being indexed. I went through our Google crawl history.

Under the "not found" folder, there is a repetitive url that end with /ads.txt

(Site)/ads.txt

Google can't crawl this part of our website. Any ideas what this is exactly? It seems like every day they try to crawl .ads.txt. When I open the link itself, I get a 404 error.

Thanks guys!