Page not found (error 404)

The page http://selfence.altervista.org/category/tutorial/?doing_wp_cron=1576217224.6193900108337402343750 was not found on this server.

This can be due to:

Pay attetion to UPPER and LOWER cases
http://site.altervista.org/Page.html is different from http://site.altervista.org/page.html