[Plugin: LeagueManager] PHP error

I have the following error and cannot remove it. Any ideas….

PHP Error Message

Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/usr/local/apache/htdocs//thumb_) is not within the allowed path(s): (/home/:/usr/lib/php:/tmp) in /home/a3238584/public_html/wp-content/plugins/leaguemanager/lib/core.php on line 298

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My webpage is at

http://caeffatrichessclub.net76.net/?page_id=27

http://ww.wp.xz.cn/extend/plugins/leaguemanager/