Error Log in devformatter directory

Whenever I log into WP backoffice, the following error_log shows up in the devformatter plugin directory:

[13-Oct-2011 11:39:19] PHP Deprecated: Function set_magic_quotes_runtime() is deprecated in /home/mydomain/public_html/wp-settings.php on line 32
[13-Oct-2011 16:39:19] PHP Warning: Cannot modify header information – headers already sent by (output started at /home/mydomain/public_html/wp-settings.php:32) in /home/mydomain/public_html/wp-content/plugins/bad-behavior/bad-behavior/screener.inc.php on line 8

http://wordpress.org/extend/plugins/devformatter/