Bug:Headers already sent warning when edit profile

I got this everytime edit profiles info:

Warning: Cannot modify header information - headers already sent by (output started at /home/example/domains/example.net/public_html/modules/boonex/world_map/classes/BxWmapModule.php:1) in/home/example/domains/example.net/public_html/inc/design.inc.php on line 101

Look like same problem here:

http://www.boonex.com/forums/topic/Upgrade-issue-Wmap-module.htm

To fixed this bug: Convert encoding of file BxWmapModule.php from UTF-8 to UTF-8 without BOM.