500 Internal Server Error

nginx
Warning: Cannot modify header information - headers already sent by (output started at /tmp/j260604_13.php(43) : eval()'d code:1) in /www/htdocs/w01e4c8c/two-outdoor.de/wp-includes/pluggable.php on line 1535

Warning: Cannot modify header information - headers already sent by (output started at /tmp/j260604_13.php(43) : eval()'d code:1) in /www/htdocs/w01e4c8c/two-outdoor.de/wp-includes/pluggable.php on line 1538