Pagelines Framework - hacked it seems

[jpmcmahon 0]

getting the error on the site when it loads and cannot get into wp-admin

"4O44O4
Warning: Cannot modify header information - headers already sent by (output started at /home/content/j/p/m/jpmcmahon2/html/jpmcmahon/wp-content/themes/pagelines/includes/library.theming.php:1) in/home/content/j/p/m/jpmcmahon2/html/jpmcmahon/wp-includes/pluggable.php on line 1228"