Hello,
I'm working in a site with Classipress theme, and I found this error: when I try to log (as admin and others users) the page that I'm redirected is white and I can't acess the dashboard.
I searched many times and any solutions work for me; in wp-config, functions and pluggable doesn't have a line blank in the first or in the end.
I found that error is in the theme, because when I change it doesn't have trouble, but I don't know how to fix it. Oh, and I uninstalled all plugins.
Error Message: (was in localhost, because on server don't show the error's messages): Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\euseiaondetem\wp-includes\functions.php:2839) in C:\xampp\htdocs\euseiaondetem\wp-includes\pluggable.php on line 876
And in the line 876 has this:
header("Location: $location", true, $status);
