PHP error happened

Technical information
Error type2
Error descriptionCannot modify header information - headers already sent by (output started at /home/gblalock/public_html/comppile/books/include/locale.php:1749)
URLwww.comppile.org/books/boynton_export.php?
Error file/home/gblalock/public_html/comppile/books/boynton_export.php
Error line137
SQL querySELECT ID_user, `_timestamp`, id, author, title, `date`, book, journal, pages, keywords, annotation FROM comppile_main where comppile_main.`date`>= 2011 AND (comppile_main.book='Upper Montclair, NJ: Boynton/Cook' OR comppile_main.book='Portsmouth, NH: Boynton/Cook Publishers' OR comppile_main.book='Portsmouth, NH: Boynton/Cook Heinemann' OR comppile_main.book='Portsmouth, NH: Boynton/Cook-Heinemann' OR comppile_main.book='Portsmouth, NH: Heinemann Boynton/Cook' OR comppile_main.book='Portsmouth, NH: Heinemann' OR comppile_main.book='Portsmouth, NH: Boynton/Cook Publishers: Heinemann' OR comppile_main.book='Portsmouth, NH: Boynton/Cook')