Hello Tom,
I activated an SSL zertifikate on my website, now I get this errors when a user tries to register.
Warning: Cannot modify header information – headers already sent by (output started at /wp-content/themes/generatepress-child/functions.php:1) in /wp-login.php on line 390
Warning: Cannot modify header information – headers already sent by (output started at /wp-content/themes/generatepress-child/functions.php:1) in /wp-login.php on line 403
Both errors go away if I delete the functions.php in my theme folder. I tried to delete parts of the content of the functions.php but that did not help, even if the functions.php is empty the error comes up.
What could be wrong?