Now, I have activated the debug modus. The error message is:
Warning: Cannot modify header information – headers already sent by (output started at /mnt/wexxxx/xxxx/htdocs/WordPress_09/wp-content/themes/aagaz-startup-pro/inc/getstarted/getstart.php:256) in /mnt/wexxxx/xxxx/htdocs/WordPress_09/wp-login.php on line 504 Warning: Cannot modify header information – headers already sent by (output started at /mnt/wexxxx/xxxx//htdocs/WordPress_09/wp-content/themes/aagaz-startup-pro/inc/getstarted/getstart.php:256) in /mnt/wexxxx/xxxx//htdocs/WordPress_09/wp-login.php on line 520 Warning: Cannot modify header information – headers already sent by (output started at /mnt/wexxxx/xxxx//htdocs/WordPress_09/wp-content/themes/aagaz-startup-pro/inc/getstarted/getstart.php:256) in /mnt/wexxxx/xxxx//htdocs/WordPress_09/wp-includes/functions.php on line 6221
