Can’t Create Pages, please help.

This is what i get:

500 Server Error
A misconfiguration on the server caused a hiccup. Check the server logs, fix the problem, then try again. URL: https://joaoleitaofoto.com/aaa-experiencia/

ok hehe i solved my problem. the thing was that i was using an .html page as homepage and all the WP php pages were not working until i set up the homepage as the WP index.php page.
thank you.