PHP error happened

Technical information
Error type	2
Error description	Cannot modify header information - headers already sent by (output started at /home/gblalock/public_html/comppile/books/include/locale.php:1749)
URL	www.comppile.org/books/teacherscollege_export.php?
Error file	/home/gblalock/public_html/comppile/books/teacherscollege_export.php
Error line	137
SQL query	SELECT ID_user, `_timestamp`, id, author, title, `date`, book, journal, pages, keywords, annotation FROM comppile_main where date>= 2012 AND (book='Teachers College Press' OR book='New York: Teachers College Press')