[Plugin: LeagueManager] Logo Team

Hello,
I use Wp 2.7 and leaguemanagerb 2.6.2, whit clean installation.
when I attach logo in team preference I receve the error:

Warning: Cannot modify header information – headers already sent by (output started at /web/htdocs/www.leonardoneri.com/home/prova/wp-admin/includes/template.php:3191) in /web/htdocs/www.leonardoneri.com/home/prova/wp-content/plugins/leaguemanager/lib/thumbnail.inc.php on line 294
?PNG ??? IHDR??????????’???? PLTE??????????^??????IDAT8??A ?0ES!???;?9E\???#.=E???*: ??r????o?????￠M????9???p????G5???b????8 ?G?^???%??f???cD?4?9??? 6???2'g??p??z9??\R?????^?G?^|??^i?_???+n??3?????IEND?B?
Fatal error: Cannot break/continue 1 level in /web/htdocs/www.leonardoneri.com/home/prova/wp-content/plugins/leaguemanager/lib/thumbnail.inc.php on line 173

Why?
Thanks!