Why does Google say I have a crawl error for url containing et_core_page_resource?
Divi returns a 404 (not found) warning when anyone (Google included) tries to follow the link. This is perfectly normal, and there is no need to do anything about it. It won’t harm your SEO.
If the warning bothers you, you can visit Divi => Theme Options => Builder => Advanced in your WordPress dashboard and disable Statis CSS File Generation.