Multisite page not opening up

OK- One of my sites in my multisite isnt working. when I try to open my dashboard for my site, it opens as a black white bage with the following script: “Warning: Cannot modify header information – headers already sent by (output started at /home3/medspx/public_html/academy/wp-content/themes/company/extras/editor.php:2) in /home3/medspx/public_html/academy/wp-includes/pluggable.php on line 1179”

What do I do?