I made one change to a theme's file and now I am getting this message:
Warning: Cannot modify header information - headers already sent by (output started at /nfs/c10/h04/mnt/148382/domains/buendiahonduras.com/html/wp-content/themes/retro/lib/shortcode/shortcodes.php:1) in /nfs/c10/h04/mnt/148382/domains/buendiahonduras.com/html/wp-includes/pluggable.php on line 896
I can't even access the admin panel.