Warning errors on login page

User login page displays the two following warnings but login still works. What’s happening and what should I do about it?
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Warning: parse_url(/wp-login.php?redirect_to=http://publicaccessmedia.net/2007/08/06/coming-soon-gardiner-area-public-access/) [function.parse-url]: Unable to parse url in /home/publicac/public_html/wp-content/plugins/podpress/podpress.php on line 151

Warning: Cannot modify header information – headers already sent by (output started at /home/publicac/public_html/wp-content/plugins/podpress/podpress.php:151) in /home/publicac/public_html/wp-login.php on line 12
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