When I go to /wp-admin/ I get a 404 not found error. This just started tonight. I don't have any plugins that change the login or the wp-admin page. my site is https://sturtz.ml/ This is all the log says.

[27-Apr-2020 12:34:36 UTC] PHP Warning: define() expects at least 2 parameters, 1 given in /var/www/main/wp-config.php on line 104 [27-Apr-2020 12:34:39 UTC] PHP Warning: define() expects at least 2 parameters, 1 given in /var/www/main/wp-config.php on line 104 [27-Apr-2020 12:34:41 UTC] PHP Warning: define() expects at least 2 parameters, 1 given in /var/www/main/wp-config.php on line 104 [27-Apr-2020 12:34:46 UTC] PHP Warning: define() expects at least 2 parameters, 1 given in /var/www/main/wp-config.php on line 104 [27-Apr-2020 12:35:33 UTC] PHP Warning: define() expects at least 2 parameters, 1 given in /var/www/main/wp-config.php on line 104 [27-Apr-2020 12:35:39 UTC] PHP Warning: define() expects at least 2 parameters, 1 given in /var/www/main/wp-config.php on line 104 [27-Apr-2020 12:35:40 UTC] PHP Warning: define() expects at least 2 parameters, 1 given in /var/www/main/wp-config.php on line 104